prototype.js

/*  Prototype JavaScript framework, version 1.6.1
 *  (c) 2005-2009 Sam Stephenson
 *
 *  Prototype is freely distributable under the terms of an MIT-style license.
 *  For details, see the Prototype web site: http://www.prototypejs.org/
 *
 *--------------------------------------------------------------------------*/

with(VersionManager.define({
	version: '1.6.1',
	global: ['ObjectRange','Position','$F',
						  'Field', 'Form','$$',
						  'Selector','Insertion','Toggle',
						  '$','Ajax','$R',
						  '$H','Hash','$w',
						  '$A','Enumerable','$continue',
						  '$break','Template','PeriodicalExecuter',
						  'Try','Abstract','Class','Prototype'],
	Array: ['each', 'eachSlice', 'all', 'any', 'collect', 'detect',
				'findAll', 'grep', 'include', 'inGroupsOf', 'inject', 'invoke', 'max',
				'min', 'partition', 'pluck', 'reject', 'sortBy', 'toArray', 'zip', 'size',
				'inspect', 'find', 'select', 'member', 'entries', '_reverse', '_each',
				'clear', 'first', 'last', 'compact', 'flatten', 'without', 'uniq', 'clone', 'toJSON', 'intersect'],
	Number: ['toColorPart', 'succ','times','toPaddedString','toJSON',
			'abs','round','ceil','floor'],
	Function: ['argumentNames', 'bind', 'bindAsEventListener', 'curry', 'delay', 'defer', 'wrap', 'methodize'],
	String: ['gsub', 'sub', 'scan', 'truncate', 'strip', 'stripTags', 'stripScripts',
			'extractScripts', 'evalScripts', 'escapeHTML', 'unescapeHTML', 'toQueryParams', 'toArray', 'succ',
			'times', 'camelize', 'capitalize', 'underscore', 'dasherize', 'inspect', 'unfilterJSON', 'isJSON', 'evalJSON', 'toJSON', 'include', 'startsWith', 'endsWith', 'empty', 'blank', 'parseQuery', 'interpolate'],
	RegExp: ['match'],
	Date: ['toJSON']}))	{
	
		var $A = function $A(iterable) {
		  if (!iterable) return [];
		  if ('toArray' in Object(iterable)) return iterable.toArray();
		  var length = iterable.length || 0, results = new Array(length);
		  while (length--) results[length] = iterable[length];
		  return results;
		}

		var $w = function $w(string) {
		  if (!Object.isString(string)) return [];
		  string = string.strip();
		  return string ? string.split(/\s+/) : [];
		}

		var $H = function $H(object) {
		  return new Hash(object);
		};

		var $R = function $R(start, end, exclusive) {
		  return new ObjectRange(start, end, exclusive);
		}

		var $ = function $(element) {
		  if (arguments.length > 1) {
		    for (var i = 0, elements = [], length = arguments.length; i < length; i++)
		      elements.push($(arguments[i]));
		    return elements;
		  }
		  if (Object.isString(element))
		    element = document.getElementById(element);
		  return Element.extend(element);
		}

		var $$ = function $$() {
		  return Selector.findChildElements(document, $A(arguments));
		}

		var Prototype = {
		  Version: '1.6.1',

		  Browser: (function(){
		    var ua = navigator.userAgent;
		    var isOpera = Object.prototype.toString.call(window.opera) == '[object Opera]';
		    return {
		      IE:             !!window.attachEvent && !isOpera,
		      Opera:          isOpera,
		      WebKit:         ua.indexOf('AppleWebKit/') > -1,
		      Gecko:          ua.indexOf('Gecko') > -1 && ua.indexOf('KHTML') === -1,
		      MobileSafari:   /Apple.*Mobile.*Safari/.test(ua)
		    }
		  })(),

		  BrowserFeatures: {
		    XPath: !!document.evaluate,
		    SelectorsAPI: !!document.querySelector,
		    ElementExtensions: (function() {
		      var constructor = window.Element || window.HTMLElement;
		      return !!(constructor && constructor.prototype);
		    })(),
		    SpecificElementExtensions: (function() {
		      if (typeof window.HTMLDivElement !== 'undefined')
		        return true;

		      var div = document.createElement('div');
		      var form = document.createElement('form');
		      var isSupported = false;

		      if (div['__proto__'] && (div['__proto__'] !== form['__proto__'])) {
		        isSupported = true;
		      }

		      div = form = null;

		      return isSupported;
		    })()
		  },

		  ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
		  JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,

		  emptyFunction: function() { },
		  K: function(x) { return x }
		};

		if (Prototype.Browser.MobileSafari)
		  Prototype.BrowserFeatures.SpecificElementExtensions = false;


		var Abstract = { };


		var Try = {
		  these: function() {
		    var returnValue;

		    for (var i = 0, length = arguments.length; i < length; i++) {
		      var lambda = arguments[i];
		      try {
		        returnValue = lambda();
		        break;
		      } catch (e) { }
		    }

		    return returnValue;
		  }
		};

		/* Based on Alex Arnell's inheritance implementation. */

		var Class = (function() {
		  function subclass() {};
		  function create() {
		    var parent = null, properties = $A(arguments);
		    if (Object.isFunction(properties[0]))
		      parent = properties.shift();

		    function klass() {
		      this.initialize.apply(this, arguments);
		    }

		    Object.extend(klass, Class.Methods);
		    klass.superclass = parent;
		    klass.subclasses = [];

		    if (parent) {
		      subclass.prototype = parent.prototype;
		      klass.prototype = new subclass;
		      parent.subclasses.push(klass);
		    }

		    for (var i = 0; i < properties.length; i++)
		      klass.addMethods(properties[i]);

		    if (!klass.prototype.initialize)
		      klass.prototype.initialize = Prototype.emptyFunction;

		    klass.prototype.constructor = klass;
		    return klass;
		  }

		  function addMethods(source) {
		    var ancestor   = this.superclass && this.superclass.prototype;
		    var properties = Object.keys(source);

		    if (!Object.keys({ toString: true }).length) {
		      if (source.toString != Object.prototype.toString)
		        properties.push("toString");
		      if (source.valueOf != Object.prototype.valueOf)
		        properties.push("valueOf");
		    }

		    for (var i = 0, length = properties.length; i < length; i++) {
		      var property = properties[i], value = source[property];
		      if (ancestor && Object.isFunction(value) &&
		          value.argumentNames().first() == "$super") {
		        var method = value;
		        value = (function(m) {
		          return function() { return ancestor[m].apply(this, arguments); };
		        })(property).wrap(method);

		        value.valueOf = method.valueOf.bind(method);
		        value.toString = method.toString.bind(method);
		      }
		      this.prototype[property] = value;
		    }

		    return this;
		  }

		  return {
		    create: create,
		    Methods: {
		      addMethods: addMethods
		    }
		  };
		})();
		(function() {

		  var _toString = Object.prototype.toString;

		  function extend(destination, source) {
		    for (var property in source)
		      destination[property] = source[property];
		    return destination;
		  }

		  function inspect(object) {
		    try {
		      if (isUndefined(object)) return 'undefined';
		      if (object === null) return 'null';
		      return object.inspect ? object.inspect() : String(object);
		    } catch (e) {
		      if (e instanceof RangeError) return '...';
		      throw e;
		    }
		  }

		  function toJSON(object) {
		    var type = typeof object;
		    switch (type) {
		      case 'undefined':
		      case 'function':
		      case 'unknown': return;
		      case 'boolean': return object.toString();
		    }

		    if (object === null) return 'null';
		    if (object.toJSON) return object.toJSON();
		    if (isElement(object)) return;

		    var results = [];
		    for (var property in object) {
		      var value = toJSON(object[property]);
		      if (!isUndefined(value))
		        results.push(property.toJSON() + ': ' + value);
		    }

		    return '{' + results.join(', ') + '}';
		  }

		  function toQueryString(object) {
		    return $H(object).toQueryString();
		  }

		  function toHTML(object) {
		    return object && object.toHTML ? object.toHTML() : String.interpret(object);
		  }

		  function keys(object) {
		    var results = [];
		    for (var property in object)
		      results.push(property);
		    return results;
		  }

		  function values(object) {
		    var results = [];
		    for (var property in object)
		      results.push(object[property]);
		    return results;
		  }

		  function clone(object) {
		    return extend({ }, object);
		  }

		  function isElement(object) {
		    return !!(object && object.nodeType == 1);
		  }

		  function isArray(object) {
		    return _toString.call(object) == "[object Array]";
		  }


		  function isHash(object) {
		    return object instanceof Hash;
		  }

		  function isFunction(object) {
		    return typeof object === "function";
		  }

		  function isString(object) {
		    return _toString.call(object) == "[object String]";
		  }

		  function isNumber(object) {
		    return _toString.call(object) == "[object Number]";
		  }

		  function isUndefined(object) {
		    return typeof object === "undefined";
		  }

		  extend(Object, {
		    extend:        extend,
		    inspect:       inspect,
		    toJSON:        toJSON,
		    toQueryString: toQueryString,
		    toHTML:        toHTML,
		    keys:          keys,
		    values:        values,
		    clone:         clone,
		    isElement:     isElement,
		    isArray:       isArray,
		    isHash:        isHash,
		    isFunction:    isFunction,
		    isString:      isString,
		    isNumber:      isNumber,
		    isUndefined:   isUndefined
		  });
		})();
		
		Object.extend(Function.prototype, (function() {
		  var slice = Array.prototype.slice;

		  function update(array, args) {
		    var arrayLength = array.length, length = args.length;
		    while (length--) array[arrayLength + length] = args[length];
		    return array;
		  }

		  function merge(array, args) {
		    array = slice.call(array, 0);
		    return update(array, args);
		  }

		  function argumentNames() {
			var names = this.toString().match(/^[\s\(]*function[^(]*\(([^)]*)\)/)[1]
		      .replace(/\/\/.*?[\r\n]|\/\*(?:.|[\r\n])*?\*\//g, '')
		      .replace(/\s+/g, '').split(',');
		    return names.length == 1 && !names[0] ? [] : names;
		  }

		  function bind(context) {
		    if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
		    var __method = this, args = slice.call(arguments, 1);
		    return function() {
		      var a = merge(args, arguments);
		      return __method.apply(context, a);
		    }
		  }

		  function bindAsEventListener(context) {
		    var __method = this, args = slice.call(arguments, 1);
		    return function(event) {
		      var a = update([event || window.event], args);
		      return __method.apply(context, a);
		    }
		  }

		  function curry() {
		    if (!arguments.length) return this;
		    var __method = this, args = slice.call(arguments, 0);
		    return function() {
		      var a = merge(args, arguments);
		      return __method.apply(this, a);
		    }
		  }

		  function delay(timeout) {
		    var __method = this, args = slice.call(arguments, 1);
		    timeout = timeout * 1000;
		    return window.setTimeout(function() {
		      return __method.apply(__method, args);
		    }, timeout);
		  }

		  function defer() {
		    var args = update([0.01], arguments);
		    return this.delay.apply(this, args);
		  }

		  function wrap(wrapper) {
		    var __method = this;
		    return function() {
		      var a = update([__method.bind(this)], arguments);
		      return wrapper.apply(this, a);
		    }
		  }

		  function methodize() {
		    if (this._methodized) return this._methodized;
		    var __method = this;
		    return this._methodized = function() {
		      var a = update([this], arguments);
		      return __method.apply(null, a);
		    };
		  }

		  return {
		    argumentNames:       argumentNames,
		    bind:                bind,
		    bindAsEventListener: bindAsEventListener,
		    curry:               curry,
		    delay:               delay,
		    defer:               defer,
		    wrap:                wrap,
		    methodize:           methodize
		  }
		})());


		Date.prototype.toJSON = function() {
		  return '"' + this.getUTCFullYear() + '-' +
		    (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
		    this.getUTCDate().toPaddedString(2) + 'T' +
		    this.getUTCHours().toPaddedString(2) + ':' +
		    this.getUTCMinutes().toPaddedString(2) + ':' +
		    this.getUTCSeconds().toPaddedString(2) + 'Z"';
		};


		RegExp.prototype.match = RegExp.prototype.test;

		RegExp.escape = function(str) {
		  return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
		};
		var PeriodicalExecuter = Class.create({
		  initialize: function(callback, frequency) {
		    this.callback = callback;
		    this.frequency = frequency;
		    this.currentlyExecuting = false;

		    this.registerCallback();
		  },

		  registerCallback: function() {
		    this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
		  },

		  execute: function() {
		    this.callback(this);
		  },

		  stop: function() {
		    if (!this.timer) return;
		    clearInterval(this.timer);
		    this.timer = null;
		  },

		  onTimerEvent: function() {
		    if (!this.currentlyExecuting) {
		      try {
		        this.currentlyExecuting = true;
		        this.execute();
		        this.currentlyExecuting = false;
		      } catch(e) {
		        this.currentlyExecuting = false;
		        throw e;
		      }
		    }
		  }
		});
		Object.extend(String, {
		  interpret: function(value) {
		    return value == null ? '' : String(value);
		  },
		  specialChar: {
		    '\b': '\\b',
		    '\t': '\\t',
		    '\n': '\\n',
		    '\f': '\\f',
		    '\r': '\\r',
		    '\\': '\\\\'
		  }
		});

		Object.extend(String.prototype, (function() {

		  function prepareReplacement(replacement) {
		    if (Object.isFunction(replacement)) return replacement;
		    var template = new Template(replacement);
		    return function(match) { return template.evaluate(match) };
		  }

		  function gsub(pattern, replacement) {
		    var result = '', source = this, match;
		    replacement = prepareReplacement(replacement);

		    if (Object.isString(pattern))
		      pattern = RegExp.escape(pattern);

		    if (!(pattern.length || pattern.source)) {
		      replacement = replacement('');
		      return replacement + source.split('').join(replacement) + replacement;
		    }

		    while (source.length > 0) {
		      if (match = source.match(pattern)) {
		        result += source.slice(0, match.index);
		        result += String.interpret(replacement(match));
		        source  = source.slice(match.index + match[0].length);
		      } else {
		        result += source, source = '';
		      }
		    }
		    return result;
		  }

		  function sub(pattern, replacement, count) {
		    replacement = prepareReplacement(replacement);
		    count = Object.isUndefined(count) ? 1 : count;

		    return this.gsub(pattern, function(match) {
		      if (--count < 0) return match[0];
		      return replacement(match);
		    });
		  }

		  function scan(pattern, iterator) {
		    this.gsub(pattern, iterator);
		    return String(this);
		  }

		  function truncate(length, truncation) {
		    length = length || 30;
		    truncation = Object.isUndefined(truncation) ? '...' : truncation;
		    return this.length > length ?
		      this.slice(0, length - truncation.length) + truncation : String(this);
		  }

		  function strip() {
		    return this.replace(/^\s+/, '').replace(/\s+$/, '');
		  }

		  function stripTags() {
		    return this.replace(/<\w+(\s+("[^"]*"|'[^']*'|[^>])+)?>|<\/\w+>/gi, '');
		  }

		  function stripScripts() {
		    return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
		  }

		  function extractScripts() {
		    var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
		    var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
		    return (this.match(matchAll) || []).map(function(scriptTag) {
		      return (scriptTag.match(matchOne) || ['', ''])[1];
		    });
		  }

		  function evalScripts() {
		    return this.extractScripts().map(function(script) { return eval(script) });
		  }

		  function escapeHTML() {
		    return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
		  }

		  function unescapeHTML() {
		    return this.stripTags().replace(/&lt;/g,'<').replace(/&gt;/g,'>').replace(/&amp;/g,'&');
		  }


		  function toQueryParams(separator) {
		    var match = this.strip().match(/([^?#]*)(#.*)?$/);
		    if (!match) return { };

		    return match[1].split(separator || '&').inject({ }, function(hash, pair) {
		      if ((pair = pair.split('='))[0]) {
		        var key = decodeURIComponent(pair.shift());
		        var value = pair.length > 1 ? pair.join('=') : pair[0];
		        if (value != undefined) value = decodeURIComponent(value);

		        if (key in hash) {
		          if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
		          hash[key].push(value);
		        }
		        else hash[key] = value;
		      }
		      return hash;
		    });
		  }

		  function toArray() {
		    return this.split('');
		  }

		  function succ() {
		    return this.slice(0, this.length - 1) +
		      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
		  }

		  function times(count) {
		    return count < 1 ? '' : new Array(count + 1).join(this);
		  }

		  function camelize() {
		    return this.replace(/-+(.)?/g, function(match, chr) {
		      return chr ? chr.toUpperCase() : '';
		    });
		  }

		  function capitalize() {
		    return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
		  }

		  function underscore() {
		    return this.replace(/::/g, '/')
		               .replace(/([A-Z]+)([A-Z][a-z])/g, '$1_$2')
		               .replace(/([a-z\d])([A-Z])/g, '$1_$2')
		               .replace(/-/g, '_')
		               .toLowerCase();
		  }

		  function dasherize() {
		    return this.replace(/_/g, '-');
		  }

		  function inspect(useDoubleQuotes) {
		    var escapedString = this.replace(/[\x00-\x1f\\]/g, function(character) {
		      if (character in String.specialChar) {
		        return String.specialChar[character];
		      }
		      return '\\u00' + character.charCodeAt().toPaddedString(2, 16);
		    });
		    if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
		    return "'" + escapedString.replace(/'/g, '\\\'') + "'";
		  }

		  function toJSON() {
		    return this.inspect(true);
		  }

		  function unfilterJSON(filter) {
		    return this.replace(filter || Prototype.JSONFilter, '$1');
		  }

		  function isJSON() {
		    var str = this;
		    if (str.blank()) return false;
		    str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
		    return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
		  }

		  function evalJSON(sanitize) {
		    var json = this.unfilterJSON();
		    try {
		      if (!sanitize || json.isJSON()) return eval('(' + json + ')');
		    } catch (e) { }
		    throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
		  }

		  function include(pattern) {
		    return this.indexOf(pattern) > -1;
		  }

		  function startsWith(pattern) {
		    return !this.lastIndexOf(pattern,0);
		  }

		  function endsWith(pattern) {
		    var d = this.length - pattern.length;
		    return d >= 0 && this.indexOf(pattern,d) === d;
		  }

		  function empty() {
		    return this == '';
		  }

		  function blank() {
		    return /^\s*$/.test(this);
		  }

		  function interpolate(object, pattern) {
		    return new Template(this, pattern).evaluate(object);
		  }
		
		  return {
		    gsub:           gsub,
		    sub:            sub,
		    scan:           scan,
		    truncate:       truncate,
		    strip:          String.prototype.trim ? String.prototype.trim : strip,
		    stripTags:      stripTags,
		    stripScripts:   stripScripts,
		    extractScripts: extractScripts,
		    evalScripts:    evalScripts,
		    escapeHTML:     escapeHTML,
		    unescapeHTML:   unescapeHTML,
		    toQueryParams:  toQueryParams,
		    parseQuery:     toQueryParams,
		    toArray:        toArray,
		    succ:           succ,
		    times:          times,
		    camelize:       camelize,
		    capitalize:     capitalize,
		    underscore:     underscore,
		    dasherize:      dasherize,
		    inspect:        inspect,
		    toJSON:         toJSON,
		    unfilterJSON:   unfilterJSON,
		    isJSON:         isJSON,
		    evalJSON:       evalJSON,
		    include:        include,
		    startsWith:     startsWith,
		    endsWith:       endsWith,
		    empty:          empty,
		    blank:          blank,
		    interpolate:    interpolate
		  };
		})());

		var Template = Class.create({
		  initialize: function(template, pattern) {
		    this.template = template.toString();
		    this.pattern = pattern || Template.Pattern;
		  },

		  evaluate: function(object) {
		    if (object && Object.isFunction(object.toTemplateReplacements))
		      object = object.toTemplateReplacements();

		    return this.template.gsub(this.pattern, function(match) {
		      if (object == null) return (match[1] + '');

		      var before = match[1] || '';
		      if (before == '\\') return match[2];

		      var ctx = object, expr = match[3];
		      var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
		      match = pattern.exec(expr);
		      if (match == null) return before;

		      while (match != null) {
		        var comp = match[1].startsWith('[') ? match[2].replace(/\\\\]/g, ']') : match[1];
		        ctx = ctx[comp];
		        if (null == ctx || '' == match[3]) break;
		        expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
		        match = pattern.exec(expr);
		      }

		      return before + String.interpret(ctx);
		    });
		  }
		});
		Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

		var $break = { };

		var Enumerable = (function() {
		  function each(iterator, context) {
		    var index = 0;
		    try {
		      this._each(function(value) {
		        iterator.call(context, value, index++);
		      });
		    } catch (e) {
		      if (e != $break) throw e;
		    }
		    return this;
		  }

		  function eachSlice(number, iterator, context) {
		    var index = -number, slices = [], array = this.toArray();
		    if (number < 1) return array;
		    while ((index += number) < array.length)
		      slices.push(array.slice(index, index+number));
		    return slices.collect(iterator, context);
		  }

		  function all(iterator, context) {
		    iterator = iterator || Prototype.K;
		    var result = true;
		    this.each(function(value, index) {
		      result = result && !!iterator.call(context, value, index);
		      if (!result) throw $break;
		    });
		    return result;
		  }

		  function any(iterator, context) {
		    iterator = iterator || Prototype.K;
		    var result = false;
		    this.each(function(value, index) {
		      if (result = !!iterator.call(context, value, index))
		        throw $break;
		    });
		    return result;
		  }

		  function collect(iterator, context) {
		    iterator = iterator || Prototype.K;
		    var results = [];
		    this.each(function(value, index) {
		      results.push(iterator.call(context, value, index));
		    });
		    return results;
		  }

		  function detect(iterator, context) {
		    var result;
		    this.each(function(value, index) {
		      if (iterator.call(context, value, index)) {
		        result = value;
		        throw $break;
		      }
		    });
		    return result;
		  }

		  function findAll(iterator, context) {
		    var results = [];
		    this.each(function(value, index) {
		      if (iterator.call(context, value, index))
		        results.push(value);
		    });
		    return results;
		  }

		  function grep(filter, iterator, context) {
		    iterator = iterator || Prototype.K;
		    var results = [];

		    if (Object.isString(filter))
		      filter = new RegExp(RegExp.escape(filter));

		    this.each(function(value, index) {
		      if (filter.match(value))
		        results.push(iterator.call(context, value, index));
		    });
		    return results;
		  }

		  function include(object) {
		    if (Object.isFunction(this.indexOf))
		      if (this.indexOf(object) != -1) return true;

		    var found = false;
		    this.each(function(value) {
		      if (value == object) {
		        found = true;
		        throw $break;
		      }
		    });
		    return found;
		  }

		  function inGroupsOf(number, fillWith) {
		    fillWith = Object.isUndefined(fillWith) ? null : fillWith;
		    return this.eachSlice(number, function(slice) {
		      while(slice.length < number) slice.push(fillWith);
		      return slice;
		    });
		  }

		  function inject(memo, iterator, context) {
		    this.each(function(value, index) {
		      memo = iterator.call(context, memo, value, index);
		    });
		    return memo;
		  }

		  function invoke(method) {
		    var args = $A(arguments).slice(1);
		    return this.map(function(value) {
		      return value[method].apply(value, args);
		    });
		  }

		  function max(iterator, context) {
		    iterator = iterator || Prototype.K;
		    var result;
		    this.each(function(value, index) {
		      value = iterator.call(context, value, index);
		      if (result == null || value >= result)
		        result = value;
		    });
		    return result;
		  }

		  function min(iterator, context) {
		    iterator = iterator || Prototype.K;
		    var result;
		    this.each(function(value, index) {
		      value = iterator.call(context, value, index);
		      if (result == null || value < result)
		        result = value;
		    });
		    return result;
		  }

		  function partition(iterator, context) {
		    iterator = iterator || Prototype.K;
		    var trues = [], falses = [];
		    this.each(function(value, index) {
		      (iterator.call(context, value, index) ?
		        trues : falses).push(value);
		    });
		    return [trues, falses];
		  }

		  function pluck(property) {
		    var results = [];
		    this.each(function(value) {
		      results.push(value[property]);
		    });
		    return results;
		  }

		  function reject(iterator, context) {
		    var results = [];
		    this.each(function(value, index) {
		      if (!iterator.call(context, value, index))
		        results.push(value);
		    });
		    return results;
		  }

		  function sortBy(iterator, context) {
		    return this.map(function(value, index) {
		      return {
		        value: value,
		        criteria: iterator.call(context, value, index)
		      };
		    }).sort(function(left, right) {
		      var a = left.criteria, b = right.criteria;
		      return a < b ? -1 : a > b ? 1 : 0;
		    }).pluck('value');
		  }

		  function toArray() {
		    return this.map();
		  }

		  function zip() {
		    var iterator = Prototype.K, args = $A(arguments);
		    if (Object.isFunction(args.last()))
		      iterator = args.pop();

		    var collections = [this].concat(args).map($A);
		    return this.map(function(value, index) {
		      return iterator(collections.pluck(index));
		    });
		  }

		  function size() {
		    return this.toArray().length;
		  }

		  function inspect() {
		    return '#<Enumerable:' + this.toArray().inspect() + '>';
		  }

		  return {
		    each:       each,
		    eachSlice:  eachSlice,
		    all:        all,
		    every:      all,
		    any:        any,
		    some:       any,
		    collect:    collect,
		    map:        collect,
		    detect:     detect,
		    findAll:    findAll,
		    select:     findAll,
		    filter:     findAll,
		    grep:       grep,
		    include:    include,
		    member:     include,
		    inGroupsOf: inGroupsOf,
		    inject:     inject,
		    invoke:     invoke,
		    max:        max,
		    min:        min,
		    partition:  partition,
		    pluck:      pluck,
		    reject:     reject,
		    sortBy:     sortBy,
		    toArray:    toArray,
		    entries:    toArray,
		    zip:        zip,
		    size:       size,
		    inspect:    inspect,
		    find:       detect
		  };
		})();

		Array.from = $A;

		(function() {
		  var arrayProto = Array.prototype,
		      slice = arrayProto.slice,
		      _each = arrayProto.forEach; // use native browser JS 1.6 implementation if available

		  function each(iterator) {
		    for (var i = 0, length = this.length; i < length; i++)
		      iterator(this[i]);
		  }
		  if (!_each) _each = each;

		  function clear() {
		    this.length = 0;
		    return this;
		  }

		  function first() {
		    return this[0];
		  }

		  function last() {
		    return this[this.length - 1];
		  }

		  function compact() {
		    return this.select(function(value) {
		      return value != null;
		    });
		  }

		  function flatten() {
		    return this.inject([], function(array, value) {
		      if (Object.isArray(value))
		        return array.concat(value.flatten());
		      array.push(value);
		      return array;
		    });
		  }

		  function without() {
		    var values = slice.call(arguments, 0);
		    return this.select(function(value) {
		      return !values.include(value);
		    });
		  }

		  function reverse(inline) {
		    return (inline === false ? this.toArray() : this)._reverse();
		  }

		  function uniq(sorted) {
		    return this.inject([], function(array, value, index) {
		      if (0 == index || (sorted ? array.last() != value : !array.include(value)))
		        array.push(value);
		      return array;
		    });
		  }

		  function intersect(array) {
		    return this.uniq().findAll(function(item) {
		      return array.detect(function(value) { return item === value });
		    });
		  }

		  function clone() {
		    return slice.call(this, 0);
		  }

		  function size() {
		    return this.length;
		  }

		  function inspect() {
		    return '[' + this.map(Object.inspect).join(', ') + ']';
		  }

		  function toJSON() {
		    var results = [];
		    this.each(function(object) {
		      var value = Object.toJSON(object);
		      if (!Object.isUndefined(value)) results.push(value);
		    });
		    return '[' + results.join(', ') + ']';
		  }

		  function indexOf(item, i) {
		    i || (i = 0);
		    var length = this.length;
		    if (i < 0) i = length + i;
		    for (; i < length; i++)
		      if (this[i] === item) return i;
		    return -1;
		  }

		  function lastIndexOf(item, i) {
		    i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
		    var n = this.slice(0, i).reverse().indexOf(item);
		    return (n < 0) ? n : i - n - 1;
		  }

		  function concat() {
		    var array = slice.call(this, 0), item;
		    for (var i = 0, length = arguments.length; i < length; i++) {
		      item = arguments[i];
		      if (Object.isArray(item) && !('callee' in item)) {
		        for (var j = 0, arrayLength = item.length; j < arrayLength; j++)
		          array.push(item[j]);
		      } else {
		        array.push(item);
		      }
		    }
		    return array;
		  }

		  Object.extend(arrayProto, Enumerable);

		  if (!arrayProto._reverse)
		    arrayProto._reverse = arrayProto.reverse;

		  Object.extend(arrayProto, {
		    _each:     _each,
		    clear:     clear,
		    first:     first,
		    last:      last,
		    compact:   compact,
		    flatten:   flatten,
		    without:   without,
		    reverse:   reverse,
		    uniq:      uniq,
		    intersect: intersect,
		    clone:     clone,
		    toArray:   clone,
		    size:      size,
		    inspect:   inspect,
		    toJSON:    toJSON
		  });

		  var CONCAT_ARGUMENTS_BUGGY = (function() {
		    return [].concat(arguments)[0][0] !== 1;
		  })(1,2)

		  if (CONCAT_ARGUMENTS_BUGGY) arrayProto.concat = concat;

		  if (!arrayProto.indexOf) arrayProto.indexOf = indexOf;
		  if (!arrayProto.lastIndexOf) arrayProto.lastIndexOf = lastIndexOf;
		})();

		var Hash = Class.create(Enumerable, (function() {
		  function initialize(object) {
		    this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
		  }


		  function _each(iterator) {
		    for (var key in this._object) {
		      var value = this._object[key], pair = [key, value];
		      pair.key = key;
		      pair.value = value;
		      iterator(pair);
		    }
		  }

		  function set(key, value) {
		    return this._object[key] = value;
		  }

		  function get(key) {
		    if (this._object[key] !== Object.prototype[key])
		      return this._object[key];
		  }

		  function unset(key) {
		    var value = this._object[key];
		    delete this._object[key];
		    return value;
		  }

		  function toObject() {
		    return Object.clone(this._object);
		  }

		  function keys() {
		    return this.pluck('key');
		  }

		  function values() {
		    return this.pluck('value');
		  }

		  function index(value) {
		    var match = this.detect(function(pair) {
		      return pair.value === value;
		    });
		    return match && match.key;
		  }

		  function merge(object) {
		    return this.clone().update(object);
		  }

		  function update(object) {
		    return new Hash(object).inject(this, function(result, pair) {
		      result.set(pair.key, pair.value);
		      return result;
		    });
		  }

		  function toQueryPair(key, value) {
		    if (Object.isUndefined(value)) return key;
		    return key + '=' + encodeURIComponent(String.interpret(value));
		  }

		  function toQueryString() {
		    return this.inject([], function(results, pair) {
		      var key = encodeURIComponent(pair.key), values = pair.value;

		      if (values && typeof values == 'object') {
		        if (Object.isArray(values))
		          return results.concat(values.map(toQueryPair.curry(key)));
		      } else results.push(toQueryPair(key, values));
		      return results;
		    }).join('&');
		  }

		  function inspect() {
		    return '#<Hash:{' + this.map(function(pair) {
		      return pair.map(Object.inspect).join(': ');
		    }).join(', ') + '}>';
		  }

		  function toJSON() {
		    return Object.toJSON(this.toObject());
		  }

		  function clone() {
		    return new Hash(this);
		  }

		  return {
		    initialize:             initialize,
		    _each:                  _each,
		    set:                    set,
		    get:                    get,
		    unset:                  unset,
		    toObject:               toObject,
		    toTemplateReplacements: toObject,
		    keys:                   keys,
		    values:                 values,
		    index:                  index,
		    merge:                  merge,
		    update:                 update,
		    toQueryString:          toQueryString,
		    inspect:                inspect,
		    toJSON:                 toJSON,
		    clone:                  clone
		  };
		})());

		Hash.from = $H;
		Object.extend(Number.prototype, (function() {
		  function toColorPart() {
		    return this.toPaddedString(2, 16);
		  }

		  function succ() {
		    return this + 1;
		  }

		  function times(iterator, context) {
		    $R(0, this, true).each(iterator, context);
		    return this;
		  }

		  function toPaddedString(length, radix) {
		    var string = this.toString(radix || 10);
		    return '0'.times(length - string.length) + string;
		  }

		  function toJSON() {
		    return isFinite(this) ? this.toString() : 'null';
		  }

		  function abs() {
		    return Math.abs(this);
		  }

		  function round() {
		    return Math.round(this);
		  }

		  function ceil() {
		    return Math.ceil(this);
		  }

		  function floor() {
		    return Math.floor(this);
		  }

		  return {
		    toColorPart:    toColorPart,
		    succ:           succ,
		    times:          times,
		    toPaddedString: toPaddedString,
		    toJSON:         toJSON,
		    abs:            abs,
		    round:          round,
		    ceil:           ceil,
		    floor:          floor
		  };
		})());

		var ObjectRange = Class.create(Enumerable, (function() {
		  function initialize(start, end, exclusive) {
		    this.start = start;
		    this.end = end;
		    this.exclusive = exclusive;
		  }

		  function _each(iterator) {
		    var value = this.start;
		    while (this.include(value)) {
		      iterator(value);
		      value = value.succ();
		    }
		  }

		  function include(value) {
		    if (value < this.start)
		      return false;
		    if (this.exclusive)
		      return value < this.end;
		    return value <= this.end;
		  }

		  return {
		    initialize: initialize,
		    _each:      _each,
		    include:    include
		  };
		})());



		var Ajax = {
		  getTransport: function() {
		    return Try.these(
		      function() {return new XMLHttpRequest()},
		      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
		      function() {return new ActiveXObject('Microsoft.XMLHTTP')}
		    ) || false;
		  },

		  activeRequestCount: 0
		};

		Ajax.Responders = {
		  responders: [],

		  _each: function(iterator) {
		    this.responders._each(iterator);
		  },

		  register: function(responder) {
		    if (!this.include(responder))
		      this.responders.push(responder);
		  },

		  unregister: function(responder) {
		    this.responders = this.responders.without(responder);
		  },

		  dispatch: function(callback, request, transport, json) {
		    this.each(function(responder) {
		      if (Object.isFunction(responder[callback])) {
		        try {
		          responder[callback].apply(responder, [request, transport, json]);
		        } catch (e) { }
		      }
		    });
		  }
		};

		Object.extend(Ajax.Responders, Enumerable);

		Ajax.Responders.register({
		  onCreate:   function() { Ajax.activeRequestCount++ },
		  onComplete: function() { Ajax.activeRequestCount-- }
		});
		Ajax.Base = Class.create({
		  initialize: function(options) {
		    this.options = {
		      method:       'post',
		      asynchronous: true,
		      contentType:  'application/x-www-form-urlencoded',
		      encoding:     'UTF-8',
		      parameters:   '',
		      evalJSON:     true,
		      evalJS:       true
		    };
		    Object.extend(this.options, options || { });

		    this.options.method = this.options.method.toLowerCase();

		    if (Object.isString(this.options.parameters))
		      this.options.parameters = this.options.parameters.toQueryParams();
		    else if (Object.isHash(this.options.parameters))
		      this.options.parameters = this.options.parameters.toObject();
		  }
		});
		Ajax.Request = Class.create(Ajax.Base, {
		  _complete: false,

		  initialize: function($super, url, options) {
		    $super(options);
		    this.transport = Ajax.getTransport();
		    this.request(url);
		  },

		  request: function(url) {
		    this.url = url;
		    this.method = this.options.method;
		    var params = Object.clone(this.options.parameters);

		    if (!['get', 'post'].include(this.method)) {
		      params['_method'] = this.method;
		      this.method = 'post';
		    }

		    this.parameters = params;

		    if (params = Object.toQueryString(params)) {
		      if (this.method == 'get')
		        this.url += (this.url.include('?') ? '&' : '?') + params;
		      else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
		        params += '&_=';
		    }

		    try {
		      var response = new Ajax.Response(this);
		      if (this.options.onCreate) this.options.onCreate(response);
		      Ajax.Responders.dispatch('onCreate', this, response);

		      this.transport.open(this.method.toUpperCase(), this.url,
		        this.options.asynchronous);

		      if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);

		      this.transport.onreadystatechange = this.onStateChange.bind(this);
		      this.setRequestHeaders();

		      this.body = this.method == 'post' ? (this.options.postBody || params) : null;
		      this.transport.send(this.body);

		      /* Force Firefox to handle ready state 4 for synchronous requests */
		      if (!this.options.asynchronous && this.transport.overrideMimeType)
		        this.onStateChange();

		    }
		    catch (e) {
		      this.dispatchException(e);
		    }
		  },

		  onStateChange: function() {
		    var readyState = this.transport.readyState;
		    if (readyState > 1 && !((readyState == 4) && this._complete))
		      this.respondToReadyState(this.transport.readyState);
		  },

		  setRequestHeaders: function() {
		    var headers = {
		      'X-Requested-With': 'XMLHttpRequest',
		      'X-Prototype-Version': Prototype.Version,
		      'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
		    };

		    if (this.method == 'post') {
		      headers['Content-type'] = this.options.contentType +
		        (this.options.encoding ? '; charset=' + this.options.encoding : '');

		      /* Force "Connection: close" for older Mozilla browsers to work
		       * around a bug where XMLHttpRequest sends an incorrect
		       * Content-length header. See Mozilla Bugzilla #246651.
		       */
		      if (this.transport.overrideMimeType &&
		          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
		            headers['Connection'] = 'close';
		    }

		    if (typeof this.options.requestHeaders == 'object') {
		      var extras = this.options.requestHeaders;

		      if (Object.isFunction(extras.push))
		        for (var i = 0, length = extras.length; i < length; i += 2)
		          headers[extras[i]] = extras[i+1];
		      else
		        $H(extras).each(function(pair) { headers[pair.key] = pair.value });
		    }

		    for (var name in headers)
		      this.transport.setRequestHeader(name, headers[name]);
		  },

		  success: function() {
		    var status = this.getStatus();
		    return !status || (status >= 200 && status < 300);
		  },

		  getStatus: function() {
		    try {
		      return this.transport.status || 0;
		    } catch (e) { return 0 }
		  },

		  respondToReadyState: function(readyState) {
		    var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

		    if (state == 'Complete') {
		      try {
		        this._complete = true;
		        (this.options['on' + response.status]
		         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
		         || Prototype.emptyFunction)(response, response.headerJSON);
		      } catch (e) {
		        this.dispatchException(e);
		      }

		      var contentType = response.getHeader('Content-type');
		      if (this.options.evalJS == 'force'
		          || (this.options.evalJS && this.isSameOrigin() && contentType
		          && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
		        this.evalResponse();
		    }

		    try {
		      (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
		      Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
		    } catch (e) {
		      this.dispatchException(e);
		    }

		    if (state == 'Complete') {
		      this.transport.onreadystatechange = Prototype.emptyFunction;
		    }
		  },

		  isSameOrigin: function() {
		    var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
		    return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
		      protocol: location.protocol,
		      domain: document.domain,
		      port: location.port ? ':' + location.port : ''
		    }));
		  },

		  getHeader: function(name) {
		    try {
		      return this.transport.getResponseHeader(name) || null;
		    } catch (e) { return null; }
		  },

		  evalResponse: function() {
		    try {
		      return eval((this.transport.responseText || '').unfilterJSON());
		    } catch (e) {
		      this.dispatchException(e);
		    }
		  },

		  dispatchException: function(exception) {
		    (this.options.onException || Prototype.emptyFunction)(this, exception);
		    Ajax.Responders.dispatch('onException', this, exception);
		  }
		});

		Ajax.Request.Events =
		  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];








		Ajax.Response = Class.create({
		  initialize: function(request){
		    this.request = request;
		    var transport  = this.transport  = request.transport,
		        readyState = this.readyState = transport.readyState;

		    if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
		      this.status       = this.getStatus();
		      this.statusText   = this.getStatusText();
		      this.responseText = String.interpret(transport.responseText);
		      this.headerJSON   = this._getHeaderJSON();
		    }

		    if(readyState == 4) {
		      var xml = transport.responseXML;
		      this.responseXML  = Object.isUndefined(xml) ? null : xml;
		      this.responseJSON = this._getResponseJSON();
		    }
		  },

		  status:      0,

		  statusText: '',

		  getStatus: Ajax.Request.prototype.getStatus,

		  getStatusText: function() {
		    try {
		      return this.transport.statusText || '';
		    } catch (e) { return '' }
		  },

		  getHeader: Ajax.Request.prototype.getHeader,

		  getAllHeaders: function() {
		    try {
		      return this.getAllResponseHeaders();
		    } catch (e) { return null }
		  },

		  getResponseHeader: function(name) {
		    return this.transport.getResponseHeader(name);
		  },

		  getAllResponseHeaders: function() {
		    return this.transport.getAllResponseHeaders();
		  },

		  _getHeaderJSON: function() {
		    var json = this.getHeader('X-JSON');
		    if (!json) return null;
		    json = decodeURIComponent(escape(json));
		    try {
		      return json.evalJSON(this.request.options.sanitizeJSON ||
		        !this.request.isSameOrigin());
		    } catch (e) {
		      this.request.dispatchException(e);
		    }
		  },

		  _getResponseJSON: function() {
		    var options = this.request.options;
		    if (!options.evalJSON || (options.evalJSON != 'force' &&
		      !(this.getHeader('Content-type') || '').include('application/json')) ||
		        this.responseText.blank())
		          return null;
		    try {
		      return this.responseText.evalJSON(options.sanitizeJSON ||
		        !this.request.isSameOrigin());
		    } catch (e) {
		      this.request.dispatchException(e);
		    }
		  }
		});

		Ajax.Updater = Class.create(Ajax.Request, {
		  initialize: function($super, container, url, options) {
		    this.container = {
		      success: (container.success || container),
		      failure: (container.failure || (container.success ? null : container))
		    };

		    options = Object.clone(options);
		    var onComplete = options.onComplete;
		    options.onComplete = (function(response, json) {
		      this.updateContent(response.responseText);
		      if (Object.isFunction(onComplete)) onComplete(response, json);
		    }).bind(this);

		    $super(url, options);
		  },

		  updateContent: function(responseText) {
		    var receiver = this.container[this.success() ? 'success' : 'failure'],
		        options = this.options;

		    if (!options.evalScripts) responseText = responseText.stripScripts();

		    if (receiver = $(receiver)) {
		      if (options.insertion) {
		        if (Object.isString(options.insertion)) {
		          var insertion = { }; insertion[options.insertion] = responseText;
		          receiver.insert(insertion);
		        }
		        else options.insertion(receiver, responseText);
		      }
		      else receiver.update(responseText);
		    }
		  }
		});

		Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
		  initialize: function($super, container, url, options) {
		    $super(options);
		    this.onComplete = this.options.onComplete;

		    this.frequency = (this.options.frequency || 2);
		    this.decay = (this.options.decay || 1);

		    this.updater = { };
		    this.container = container;
		    this.url = url;

		    this.start();
		  },

		  start: function() {
		    this.options.onComplete = this.updateComplete.bind(this);
		    this.onTimerEvent();
		  },

		  stop: function() {
		    this.updater.options.onComplete = undefined;
		    clearTimeout(this.timer);
		    (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
		  },

		  updateComplete: function(response) {
		    if (this.options.decay) {
		      this.decay = (response.responseText == this.lastText ?
		        this.decay * this.options.decay : 1);

		      this.lastText = response.responseText;
		    }
		    this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
		  },

		  onTimerEvent: function() {
		    this.updater = new Ajax.Updater(this.container, this.url, this.options);
		  }
		});


		if (Prototype.BrowserFeatures.XPath) {
		  document._getElementsByXPath = function(expression, parentElement) {
		    var results = [];
		    var query = document.evaluate(expression, $(parentElement) || document,
		      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
		    for (var i = 0, length = query.snapshotLength; i < length; i++)
		      results.push(Element.extend(query.snapshotItem(i)));
		    return results;
		  };
		}

		/*--------------------------------------------------------------------------*/

		if (!window.Node) var Node = { };

		if (!Node.ELEMENT_NODE) {
		  Object.extend(Node, {
		    ELEMENT_NODE: 1,
		    ATTRIBUTE_NODE: 2,
		    TEXT_NODE: 3,
		    CDATA_SECTION_NODE: 4,
		    ENTITY_REFERENCE_NODE: 5,
		    ENTITY_NODE: 6,
		    PROCESSING_INSTRUCTION_NODE: 7,
		    COMMENT_NODE: 8,
		    DOCUMENT_NODE: 9,
		    DOCUMENT_TYPE_NODE: 10,
		    DOCUMENT_FRAGMENT_NODE: 11,
		    NOTATION_NODE: 12
		  });
		}


		(function(global) {

		  var SETATTRIBUTE_IGNORES_NAME = (function(){
		    var elForm = document.createElement("form");
		    var elInput = document.createElement("input");
		    var root = document.documentElement;
		    elInput.setAttribute("name", "test");
		    elForm.appendChild(elInput);
		    root.appendChild(elForm);
		    var isBuggy = elForm.elements
		      ? (typeof elForm.elements.test == "undefined")
		      : null;
		    root.removeChild(elForm);
		    elForm = elInput = null;
		    return isBuggy;
		  })();

		  var element = global.Element;
		  global.Element = function(tagName, attributes) {
		    attributes = attributes || { };
		    tagName = tagName.toLowerCase();
		    var cache = Element.cache;
		    if (SETATTRIBUTE_IGNORES_NAME && attributes.name) {
		      tagName = '<' + tagName + ' name="' + attributes.name + '">';
		      delete attributes.name;
		      return Element.writeAttribute(document.createElement(tagName), attributes);
		    }
		    if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
		    return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
		  };
		  Object.extend(global.Element, element || { });
		  if (element) global.Element.prototype = element.prototype;
		})(this);

		Element.cache = { };
		Element.idCounter = 1;

		Element.Methods = {
		  visible: function(element) {
		    return $(element).style.display != 'none';
		  },

		  toggle: function(element) {
		    element = $(element);
		    Element[Element.visible(element) ? 'hide' : 'show'](element);
		    return element;
		  },


		  hide: function(element) {
		    element = $(element);
		    element.style.display = 'none';
		    return element;
		  },

		  show: function(element) {
		    element = $(element);
		    element.style.display = '';
		    return element;
		  },

		  remove: function(element) {
		    element = $(element);
		    element.parentNode.removeChild(element);
		    return element;
		  },

		  update: (function(){

		    var SELECT_ELEMENT_INNERHTML_BUGGY = (function(){
		      var el = document.createElement("select"),
		          isBuggy = true;
		      el.innerHTML = "<option value=\"test\">test</option>";
		      if (el.options && el.options[0]) {
		        isBuggy = el.options[0].nodeName.toUpperCase() !== "OPTION";
		      }
		      el = null;
		      return isBuggy;
		    })();

		    var TABLE_ELEMENT_INNERHTML_BUGGY = (function(){
		      try {
		        var el = document.createElement("table");
		        if (el && el.tBodies) {
		          el.innerHTML = "<tbody><tr><td>test</td></tr></tbody>";
		          var isBuggy = typeof el.tBodies[0] == "undefined";
		          el = null;
		          return isBuggy;
		        }
		      } catch (e) {
		        return true;
		      }
		    })();

		    var SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING = (function () {
		      var s = document.createElement("script"),
		          isBuggy = false;
		      try {
		        s.appendChild(document.createTextNode(""));
		        isBuggy = !s.firstChild ||
		          s.firstChild && s.firstChild.nodeType !== 3;
		      } catch (e) {
		        isBuggy = true;
		      }
		      s = null;
		      return isBuggy;
		    })();

		    function update(element, content) {
		      element = $(element);

		      if (content && content.toElement)
		        content = content.toElement();

		      if (Object.isElement(content))
		        return element.update().insert(content);

		      content = Object.toHTML(content);

		      var tagName = element.tagName.toUpperCase();

		      if (tagName === 'SCRIPT' && SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING) {
		        element.text = content;
		        return element;
		      }

		      if (SELECT_ELEMENT_INNERHTML_BUGGY || TABLE_ELEMENT_INNERHTML_BUGGY) {
		        if (tagName in Element._insertionTranslations.tags) {
		          while (element.firstChild) {
		            element.removeChild(element.firstChild);
		          }
		          Element._getContentFromAnonymousElement(tagName, content.stripScripts())
		            .each(function(node) {
		              element.appendChild(node)
		            });
		        }
		        else {
		          element.innerHTML = content.stripScripts();
		        }
		      }
		      else {
		        element.innerHTML = content.stripScripts();
		      }

		      content.evalScripts.bind(content).defer();
		      return element;
		    }

		    return update;
		  })(),

		  replace: function(element, content) {
		    element = $(element);
		    if (content && content.toElement) content = content.toElement();
		    else if (!Object.isElement(content)) {
		      content = Object.toHTML(content);
		      var range = element.ownerDocument.createRange();
		      range.selectNode(element);
		      content.evalScripts.bind(content).defer();
		      content = range.createContextualFragment(content.stripScripts());
		    }
		    element.parentNode.replaceChild(content, element);
		    return element;
		  },

		  insert: function(element, insertions) {
		    element = $(element);

		    if (Object.isString(insertions) || Object.isNumber(insertions) ||
		        Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
		          insertions = {bottom:insertions};

		    var content, insert, tagName, childNodes;

		    for (var position in insertions) {
		      content  = insertions[position];
		      position = position.toLowerCase();
		      insert = Element._insertionTranslations[position];

		      if (content && content.toElement) content = content.toElement();
		      if (Object.isElement(content)) {
		        insert(element, content);
		        continue;
		      }

		      content = Object.toHTML(content);

		      tagName = ((position == 'before' || position == 'after')
		        ? element.parentNode : element).tagName.toUpperCase();

		      childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());

		      if (position == 'top' || position == 'after') childNodes.reverse();
		      childNodes.each(insert.curry(element));

		      content.evalScripts.bind(content).defer();
		    }

		    return element;
		  },

		  wrap: function(element, wrapper, attributes) {
		    element = $(element);
		    if (Object.isElement(wrapper))
		      $(wrapper).writeAttribute(attributes || { });
		    else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
		    else wrapper = new Element('div', wrapper);
		    if (element.parentNode)
		      element.parentNode.replaceChild(wrapper, element);
		    wrapper.appendChild(element);
		    return wrapper;
		  },

		  inspect: function(element) {
		    element = $(element);
		    var result = '<' + element.tagName.toLowerCase();
		    $H({'id': 'id', 'className': 'class'}).each(function(pair) {
		      var property = pair.first(), attribute = pair.last();
		      var value = (element[property] || '').toString();
		      if (value) result += ' ' + attribute + '=' + value.inspect(true);
		    });
		    return result + '>';
		  },

		  recursivelyCollect: function(element, property) {
		    element = $(element);
		    var elements = [];
		    while (element = element[property])
		      if (element.nodeType == 1)
		        elements.push(Element.extend(element));
		    return elements;
		  },

		  ancestors: function(element) {
		    return Element.recursivelyCollect(element, 'parentNode');
		  },

		  descendants: function(element) {
		    return Element.select(element, "*");
		  },

		  firstDescendant: function(element) {
		    element = $(element).firstChild;
		    while (element && element.nodeType != 1) element = element.nextSibling;
		    return $(element);
		  },

		  immediateDescendants: function(element) {
		    if (!(element = $(element).firstChild)) return [];
		    while (element && element.nodeType != 1) element = element.nextSibling;
		    if (element) return [element].concat($(element).nextSiblings());
		    return [];
		  },

		  previousSiblings: function(element) {
		    return Element.recursivelyCollect(element, 'previousSibling');
		  },

		  nextSiblings: function(element) {
		    return Element.recursivelyCollect(element, 'nextSibling');
		  },

		  siblings: function(element) {
		    element = $(element);
		    return Element.previousSiblings(element).reverse()
		      .concat(Element.nextSiblings(element));
		  },

		  match: function(element, selector) {
		    if (Object.isString(selector))
		      selector = new Selector(selector);
		    return selector.match($(element));
		  },

		  up: function(element, expression, index) {
		    element = $(element);
		    if (arguments.length == 1) return $(element.parentNode);
		    var ancestors = Element.ancestors(element);
		    return Object.isNumber(expression) ? ancestors[expression] :
		      Selector.findElement(ancestors, expression, index);
		  },

		  down: function(element, expression, index) {
		    element = $(element);
		    if (arguments.length == 1) return Element.firstDescendant(element);
		    return Object.isNumber(expression) ? Element.descendants(element)[expression] :
		      Element.select(element, expression)[index || 0];
		  },

		  previous: function(element, expression, index) {
		    element = $(element);
		    if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
		    var previousSiblings = Element.previousSiblings(element);
		    return Object.isNumber(expression) ? previousSiblings[expression] :
		      Selector.findElement(previousSiblings, expression, index);
		  },

		  next: function(element, expression, index) {
		    element = $(element);
		    if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
		    var nextSiblings = Element.nextSiblings(element);
		    return Object.isNumber(expression) ? nextSiblings[expression] :
		      Selector.findElement(nextSiblings, expression, index);
		  },


		  select: function(element) {
		    var args = Array.prototype.slice.call(arguments, 1);
		    return Selector.findChildElements(element, args);
		  },

		  adjacent: function(element) {
		    var args = Array.prototype.slice.call(arguments, 1);
		    return Selector.findChildElements(element.parentNode, args).without(element);
		  },

		  identify: function(element) {
		    element = $(element);
		    var id = Element.readAttribute(element, 'id');
		    if (id) return id;
		    do { id = 'anonymous_element_' + Element.idCounter++ } while ($(id));
		    Element.writeAttribute(element, 'id', id);
		    return id;
		  },

		  readAttribute: function(element, name) {
		    element = $(element);
		    if (Prototype.Browser.IE) {
		      var t = Element._attributeTranslations.read;
		      if (t.values[name]) return t.values[name](element, name);
		      if (t.names[name]) name = t.names[name];
		      if (name.include(':')) {
		        return (!element.attributes || !element.attributes[name]) ? null :
		         element.attributes[name].value;
		      }
		    }
		    return element.getAttribute(name);
		  },

		  writeAttribute: function(element, name, value) {
		    element = $(element);
		    var attributes = { }, t = Element._attributeTranslations.write;

		    if (typeof name == 'object') attributes = name;
		    else attributes[name] = Object.isUndefined(value) ? true : value;

		    for (var attr in attributes) {
		      name = t.names[attr] || attr;
		      value = attributes[attr];
		      if (t.values[attr]) name = t.values[attr](element, value);
		      if (value === false || value === null)
		        element.removeAttribute(name);
		      else if (value === true)
		        element.setAttribute(name, name);
		      else element.setAttribute(name, value);
		    }
		    return element;
		  },

		  getHeight: function(element) {
		    return Element.getDimensions(element).height;
		  },

		  getWidth: function(element) {
		    return Element.getDimensions(element).width;
		  },

		  classNames: function(element) {
		    return new Element.ClassNames(element);
		  },

		  hasClassName: function(element, className) {
		    if (!(element = $(element))) return;
		    var elementClassName = element.className;
		    return (elementClassName.length > 0 && (elementClassName == className ||
		      new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
		  },

		  addClassName: function(element, className) {
		    if (!(element = $(element))) return;
		    if (!Element.hasClassName(element, className))
		      element.className += (element.className ? ' ' : '') + className;
		    return element;
		  },

		  removeClassName: function(element, className) {
		    if (!(element = $(element))) return;
		    element.className = element.className.replace(
		      new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
		    return element;
		  },

		  toggleClassName: function(element, className) {
		    if (!(element = $(element))) return;
		    return Element[Element.hasClassName(element, className) ?
		      'removeClassName' : 'addClassName'](element, className);
		  },

		  cleanWhitespace: function(element) {
		    element = $(element);
		    var node = element.firstChild;
		    while (node) {
		      var nextNode = node.nextSibling;
		      if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
		        element.removeChild(node);
		      node = nextNode;
		    }
		    return element;
		  },

		  empty: function(element) {
		    return $(element).innerHTML.blank();
		  },

		  descendantOf: function(element, ancestor) {
		    element = $(element), ancestor = $(ancestor);

		    if (element.compareDocumentPosition)
		      return (element.compareDocumentPosition(ancestor) & 8) === 8;

		    if (ancestor.contains)
		      return ancestor.contains(element) && ancestor !== element;

		    while (element = element.parentNode)
		      if (element == ancestor) return true;

		    return false;
		  },

		  scrollTo: function(element) {
		    element = $(element);
		    var pos = Element.cumulativeOffset(element);
		    window.scrollTo(pos[0], pos[1]);
		    return element;
		  },

		  getStyle: function(element, style) {
		    element = $(element);
		    style = style == 'float' ? 'cssFloat' : style.camelize();
		    var value = element.style[style];
		    if (!value || value == 'auto') {
		      var css = document.defaultView.getComputedStyle(element, null);
		      value = css ? css[style] : null;
		    }
		    if (style == 'opacity') return value ? parseFloat(value) : 1.0;
		    return value == 'auto' ? null : value;
		  },

		  getOpacity: function(element) {
		    return $(element).getStyle('opacity');
		  },

		  setStyle: function(element, styles) {
		    element = $(element);
		    var elementStyle = element.style, match;
		    if (Object.isString(styles)) {
		      element.style.cssText += ';' + styles;
		      return styles.include('opacity') ?
		        element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
		    }
		    for (var property in styles)
		      if (property == 'opacity') element.setOpacity(styles[property]);
		      else
		        elementStyle[(property == 'float' || property == 'cssFloat') ?
		          (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
		            property] = styles[property];

		    return element;
		  },

		  setOpacity: function(element, value) {
		    element = $(element);
		    element.style.opacity = (value == 1 || value === '') ? '' :
		      (value < 0.00001) ? 0 : value;
		    return element;
		  },

		  getDimensions: function(element) {
		    element = $(element);
		    var display = Element.getStyle(element, 'display');
		    if (display != 'none' && display != null) // Safari bug
		      return {width: element.offsetWidth, height: element.offsetHeight};

		    var els = element.style;
		    var originalVisibility = els.visibility;
		    var originalPosition = els.position;
		    var originalDisplay = els.display;
		    els.visibility = 'hidden';
		    if (originalPosition != 'fixed') // Switching fixed to absolute causes issues in Safari
		      els.position = 'absolute';
		    els.display = 'block';
		    var originalWidth = element.clientWidth;
		    var originalHeight = element.clientHeight;
		    els.display = originalDisplay;
		    els.position = originalPosition;
		    els.visibility = originalVisibility;
		    return {width: originalWidth, height: originalHeight};
		  },

		  makePositioned: function(element) {
		    element = $(element);
		    var pos = Element.getStyle(element, 'position');
		    if (pos == 'static' || !pos) {
		      element._madePositioned = true;
		      element.style.position = 'relative';
		      if (Prototype.Browser.Opera) {
		        element.style.top = 0;
		        element.style.left = 0;
		      }
		    }
		    return element;
		  },

		  undoPositioned: function(element) {
		    element = $(element);
		    if (element._madePositioned) {
		      element._madePositioned = undefined;
		      element.style.position =
		        element.style.top =
		        element.style.left =
		        element.style.bottom =
		        element.style.right = '';
		    }
		    return element;
		  },

		  makeClipping: function(element) {
		    element = $(element);
		    if (element._overflow) return element;
		    element._overflow = Element.getStyle(element, 'overflow') || 'auto';
		    if (element._overflow !== 'hidden')
		      element.style.overflow = 'hidden';
		    return element;
		  },

		  undoClipping: function(element) {
		    element = $(element);
		    if (!element._overflow) return element;
		    element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
		    element._overflow = null;
		    return element;
		  },

		  cumulativeOffset: function(element) {
		    var valueT = 0, valueL = 0;
		    do {
		      valueT += element.offsetTop  || 0;
		      valueL += element.offsetLeft || 0;
		      element = element.offsetParent;
		    } while (element);
		    return Element._returnOffset(valueL, valueT);
		  },

		  positionedOffset: function(element) {
		    var valueT = 0, valueL = 0;
		    do {
		      valueT += element.offsetTop  || 0;
		      valueL += element.offsetLeft || 0;
		      element = element.offsetParent;
		      if (element) {
		        if (element.tagName.toUpperCase() == 'BODY') break;
		        var p = Element.getStyle(element, 'position');
		        if (p !== 'static') break;
		      }
		    } while (element);
		    return Element._returnOffset(valueL, valueT);
		  },

		  absolutize: function(element) {
		    element = $(element);
		    if (Element.getStyle(element, 'position') == 'absolute') return element;

		    var offsets = Element.positionedOffset(element);
		    var top     = offsets[1];
		    var left    = offsets[0];
		    var width   = element.clientWidth;
		    var height  = element.clientHeight;

		    element._originalLeft   = left - parseFloat(element.style.left  || 0);
		    element._originalTop    = top  - parseFloat(element.style.top || 0);
		    element._originalWidth  = element.style.width;
		    element._originalHeight = element.style.height;

		    element.style.position = 'absolute';
		    element.style.top    = top + 'px';
		    element.style.left   = left + 'px';
		    element.style.width  = width + 'px';
		    element.style.height = height + 'px';
		    return element;
		  },

		  relativize: function(element) {
		    element = $(element);
		    if (Element.getStyle(element, 'position') == 'relative') return element;

		    element.style.position = 'relative';
		    var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
		    var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

		    element.style.top    = top + 'px';
		    element.style.left   = left + 'px';
		    element.style.height = element._originalHeight;
		    element.style.width  = element._originalWidth;
		    return element;
		  },

		  cumulativeScrollOffset: function(element) {
		    var valueT = 0, valueL = 0;
		    do {
		      valueT += element.scrollTop  || 0;
		      valueL += element.scrollLeft || 0;
		      element = element.parentNode;
		    } while (element);
		    return Element._returnOffset(valueL, valueT);
		  },

		  getOffsetParent: function(element) {
		    if (element.offsetParent) return $(element.offsetParent);
		    if (element == document.body) return $(element);

		    while ((element = element.parentNode) && element != document.body)
		      if (Element.getStyle(element, 'position') != 'static')
		        return $(element);

		    return $(document.body);
		  },

		  viewportOffset: function(forElement) {
		    var valueT = 0, valueL = 0;

		    var element = forElement;
		    do {
		      valueT += element.offsetTop  || 0;
		      valueL += element.offsetLeft || 0;

		      if (element.offsetParent == document.body &&
		        Element.getStyle(element, 'position') == 'absolute') break;

		    } while (element = element.offsetParent);

		    element = forElement;
		    do {
		      if (!Prototype.Browser.Opera || (element.tagName && (element.tagName.toUpperCase() == 'BODY'))) {
		        valueT -= element.scrollTop  || 0;
		        valueL -= element.scrollLeft || 0;
		      }
		    } while (element = element.parentNode);

		    return Element._returnOffset(valueL, valueT);
		  },

		  clonePosition: function(element, source) {
		    var options = Object.extend({
		      setLeft:    true,
		      setTop:     true,
		      setWidth:   true,
		      setHeight:  true,
		      offsetTop:  0,
		      offsetLeft: 0
		    }, arguments[2] || { });

		    source = $(source);
		    var p = Element.viewportOffset(source);

		    element = $(element);
		    var delta = [0, 0];
		    var parent = null;
		    if (Element.getStyle(element, 'position') == 'absolute') {
		      parent = Element.getOffsetParent(element);
		      delta = Element.viewportOffset(parent);
		    }

		    if (parent == document.body) {
		      delta[0] -= document.body.offsetLeft;
		      delta[1] -= document.body.offsetTop;
		    }

		    if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
		    if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
		    if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
		    if (options.setHeight) element.style.height = source.offsetHeight + 'px';
		    return element;
		  }
		};

		Object.extend(Element.Methods, {
		  getElementsBySelector: Element.Methods.select,

		  childElements: Element.Methods.immediateDescendants
		});

		Element._attributeTranslations = {
		  write: {
		    names: {
		      className: 'class',
		      htmlFor:   'for'
		    },
		    values: { }
		  }
		};

		if (Prototype.Browser.Opera) {
		  Element.Methods.getStyle = Element.Methods.getStyle.wrap(
		    function(proceed, element, style) {
		      switch (style) {
		        case 'left': case 'top': case 'right': case 'bottom':
		          if (proceed(element, 'position') === 'static') return null;
		        case 'height': case 'width':
		          if (!Element.visible(element)) return null;

		          var dim = parseInt(proceed(element, style), 10);

		          if (dim !== element['offset' + style.capitalize()])
		            return dim + 'px';

		          var properties;
		          if (style === 'height') {
		            properties = ['border-top-width', 'padding-top',
		             'padding-bottom', 'border-bottom-width'];
		          }
		          else {
		            properties = ['border-left-width', 'padding-left',
		             'padding-right', 'border-right-width'];
		          }
		          return properties.inject(dim, function(memo, property) {
		            var val = proceed(element, property);
		            return val === null ? memo : memo - parseInt(val, 10);
		          }) + 'px';
		        default: return proceed(element, style);
		      }
		    }
		  );

		  Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
		    function(proceed, element, attribute) {
		      if (attribute === 'title') return element.title;
		      return proceed(element, attribute);
		    }
		  );
		}

		else if (Prototype.Browser.IE) {
		  Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
		    function(proceed, element) {
		      element = $(element);
		      try { element.offsetParent }
		      catch(e) { return $(document.body) }
		      var position = element.getStyle('position');
		      if (position !== 'static') return proceed(element);
		      element.setStyle({ position: 'relative' });
		      var value = proceed(element);
		      element.setStyle({ position: position });
		      return value;
		    }
		  );

		  $w('positionedOffset viewportOffset').each(function(method) {
		    Element.Methods[method] = Element.Methods[method].wrap(
		      function(proceed, element) {
		        element = $(element);
		        try { element.offsetParent }
		        catch(e) { return Element._returnOffset(0,0) }
		        var position = element.getStyle('position');
		        if (position !== 'static') return proceed(element);
		        var offsetParent = element.getOffsetParent();
		        if (offsetParent && offsetParent.getStyle('position') === 'fixed')
		          offsetParent.setStyle({ zoom: 1 });
		        element.setStyle({ position: 'relative' });
		        var value = proceed(element);
		        element.setStyle({ position: position });
		        return value;
		      }
		    );
		  });

		  Element.Methods.cumulativeOffset = Element.Methods.cumulativeOffset.wrap(
		    function(proceed, element) {
		      try { element.offsetParent }
		      catch(e) { return Element._returnOffset(0,0) }
		      return proceed(element);
		    }
		  );

		  Element.Methods.getStyle = function(element, style) {
		    element = $(element);
		    style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
		    var value = element.style[style];
		    if (!value && element.currentStyle) value = element.currentStyle[style];

		    if (style == 'opacity') {
		      if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
		        if (value[1]) return parseFloat(value[1]) / 100;
		      return 1.0;
		    }

		    if (value == 'auto') {
		      if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
		        return element['offset' + style.capitalize()] + 'px';
		      return null;
		    }
		    return value;
		  };

		  Element.Methods.setOpacity = function(element, value) {
		    function stripAlpha(filter){
		      return filter.replace(/alpha\([^\)]*\)/gi,'');
		    }
		    element = $(element);
		    var currentStyle = element.currentStyle;
		    if ((currentStyle && !currentStyle.hasLayout) ||
		      (!currentStyle && element.style.zoom == 'normal'))
		        element.style.zoom = 1;

		    var filter = element.getStyle('filter'), style = element.style;
		    if (value == 1 || value === '') {
		      (filter = stripAlpha(filter)) ?
		        style.filter = filter : style.removeAttribute('filter');
		      return element;
		    } else if (value < 0.00001) value = 0;
		    style.filter = stripAlpha(filter) +
		      'alpha(opacity=' + (value * 100) + ')';
		    return element;
		  };

		  Element._attributeTranslations = (function(){

		    var classProp = 'className';
		    var forProp = 'for';

		    var el = document.createElement('div');

		    el.setAttribute(classProp, 'x');

		    if (el.className !== 'x') {
		      el.setAttribute('class', 'x');
		      if (el.className === 'x') {
		        classProp = 'class';
		      }
		    }
		    el = null;

		    el = document.createElement('label');
		    el.setAttribute(forProp, 'x');
		    if (el.htmlFor !== 'x') {
		      el.setAttribute('htmlFor', 'x');
		      if (el.htmlFor === 'x') {
		        forProp = 'htmlFor';
		      }
		    }
		    el = null;

		    return {
		      read: {
		        names: {
		          'class':      classProp,
		          'className':  classProp,
		          'for':        forProp,
		          'htmlFor':    forProp
		        },
		        values: {
		          _getAttr: function(element, attribute) {
		            return element.getAttribute(attribute);
		          },
		          _getAttr2: function(element, attribute) {
		            return element.getAttribute(attribute, 2);
		          },
		          _getAttrNode: function(element, attribute) {
		            var node = element.getAttributeNode(attribute);
		            return node ? node.value : "";
		          },
		          _getEv: (function(){

		            var el = document.createElement('div');
		            el.onclick = Prototype.emptyFunction;
		            var value = el.getAttribute('onclick');
		            var f;

		            if (String(value).indexOf('{') > -1) {
		              f = function(element, attribute) {
		                attribute = element.getAttribute(attribute);
		                if (!attribute) return null;
		                attribute = attribute.toString();
		                attribute = attribute.split('{')[1];
		                attribute = attribute.split('}')[0];
		                return attribute.strip();
		              };
		            }
		            else if (value === '') {
		              f = function(element, attribute) {
		                attribute = element.getAttribute(attribute);
		                if (!attribute) return null;
		                return attribute.strip();
		              };
		            }
		            el = null;
		            return f;
		          })(),
		          _flag: function(element, attribute) {
		            return $(element).hasAttribute(attribute) ? attribute : null;
		          },
		          style: function(element) {
		            return element.style.cssText.toLowerCase();
		          },
		          title: function(element) {
		            return element.title;
		          }
		        }
		      }
		    }
		  })();

		  Element._attributeTranslations.write = {
		    names: Object.extend({
		      cellpadding: 'cellPadding',
		      cellspacing: 'cellSpacing'
		    }, Element._attributeTranslations.read.names),
		    values: {
		      checked: function(element, value) {
		        element.checked = !!value;
		      },

		      style: function(element, value) {
		        element.style.cssText = value ? value : '';
		      }
		    }
		  };

		  Element._attributeTranslations.has = {};

		  $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
		      'encType maxLength readOnly longDesc frameBorder').each(function(attr) {
		    Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
		    Element._attributeTranslations.has[attr.toLowerCase()] = attr;
		  });

		  (function(v) {
		    Object.extend(v, {
		      href:        v._getAttr2,
		      src:         v._getAttr2,
		      type:        v._getAttr,
		      action:      v._getAttrNode,
		      disabled:    v._flag,
		      checked:     v._flag,
		      readonly:    v._flag,
		      multiple:    v._flag,
		      onload:      v._getEv,
		      onunload:    v._getEv,
		      onclick:     v._getEv,
		      ondblclick:  v._getEv,
		      onmousedown: v._getEv,
		      onmouseup:   v._getEv,
		      onmouseover: v._getEv,
		      onmousemove: v._getEv,
		      onmouseout:  v._getEv,
		      onfocus:     v._getEv,
		      onblur:      v._getEv,
		      onkeypress:  v._getEv,
		      onkeydown:   v._getEv,
		      onkeyup:     v._getEv,
		      onsubmit:    v._getEv,
		      onreset:     v._getEv,
		      onselect:    v._getEv,
		      onchange:    v._getEv
		    });
		  })(Element._attributeTranslations.read.values);

		  if (Prototype.BrowserFeatures.ElementExtensions) {
		    (function() {
		      function _descendants(element) {
		        var nodes = element.getElementsByTagName('*'), results = [];
		        for (var i = 0, node; node = nodes[i]; i++)
		          if (node.tagName !== "!") // Filter out comment nodes.
		            results.push(node);
		        return results;
		      }

		      Element.Methods.down = function(element, expression, index) {
		        element = $(element);
		        if (arguments.length == 1) return element.firstDescendant();
		        return Object.isNumber(expression) ? _descendants(element)[expression] :
		          Element.select(element, expression)[index || 0];
		      }
		    })();
		  }

		}

		else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
		  Element.Methods.setOpacity = function(element, value) {
		    element = $(element);
		    element.style.opacity = (value == 1) ? 0.999999 :
		      (value === '') ? '' : (value < 0.00001) ? 0 : value;
		    return element;
		  };
		}

		else if (Prototype.Browser.WebKit) {
		  Element.Methods.setOpacity = function(element, value) {
		    element = $(element);
		    element.style.opacity = (value == 1 || value === '') ? '' :
		      (value < 0.00001) ? 0 : value;

		    if (value == 1)
		      if(element.tagName.toUpperCase() == 'IMG' && element.width) {
		        element.width++; element.width--;
		      } else try {
		        var n = document.createTextNode(' ');
		        element.appendChild(n);
		        element.removeChild(n);
		      } catch (e) { }

		    return element;
		  };

		  Element.Methods.cumulativeOffset = function(element) {
		    var valueT = 0, valueL = 0;
		    do {
		      valueT += element.offsetTop  || 0;
		      valueL += element.offsetLeft || 0;
		      if (element.offsetParent == document.body)
		        if (Element.getStyle(element, 'position') == 'absolute') break;

		      element = element.offsetParent;
		    } while (element);

		    return Element._returnOffset(valueL, valueT);
		  };
		}

		if ('outerHTML' in document.documentElement) {
		  Element.Methods.replace = function(element, content) {
		    element = $(element);

		    if (content && content.toElement) content = content.toElement();
		    if (Object.isElement(content)) {
		      element.parentNode.replaceChild(content, element);
		      return element;
		    }

		    content = Object.toHTML(content);
		    var parent = element.parentNode, tagName = parent.tagName.toUpperCase();

		    if (Element._insertionTranslations.tags[tagName]) {
		      var nextSibling = element.next();
		      var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
		      parent.removeChild(element);
		      if (nextSibling)
		        fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
		      else
		        fragments.each(function(node) { parent.appendChild(node) });
		    }
		    else element.outerHTML = content.stripScripts();

		    content.evalScripts.bind(content).defer();
		    return element;
		  };
		}

		Element._returnOffset = function(l, t) {
		  var result = [l, t];
		  result.left = l;
		  result.top = t;
		  return result;
		};

		Element._getContentFromAnonymousElement = function(tagName, html) {
		  var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
		  if (t) {
		    div.innerHTML = t[0] + html + t[1];
		    t[2].times(function() { div = div.firstChild });
		  } else div.innerHTML = html;
		  return $A(div.childNodes);
		};

		Element._insertionTranslations = {
		  before: function(element, node) {
		    element.parentNode.insertBefore(node, element);
		  },
		  top: function(element, node) {
		    element.insertBefore(node, element.firstChild);
		  },
		  bottom: function(element, node) {
		    element.appendChild(node);
		  },
		  after: function(element, node) {
		    element.parentNode.insertBefore(node, element.nextSibling);
		  },
		  tags: {
		    TABLE:  ['<table>',                '</table>',                   1],
		    TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
		    TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
		    TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
		    SELECT: ['<select>',               '</select>',                  1]
		  }
		};

		(function() {
		  var tags = Element._insertionTranslations.tags;
		  Object.extend(tags, {
		    THEAD: tags.TBODY,
		    TFOOT: tags.TBODY,
		    TH:    tags.TD
		  });
		})();

		Element.Methods.Simulated = {
		  hasAttribute: function(element, attribute) {
		    attribute = Element._attributeTranslations.has[attribute] || attribute;
		    var node = $(element).getAttributeNode(attribute);
		    return !!(node && node.specified);
		  }
		};

		Element.Methods.ByTag = { };

		Object.extend(Element, Element.Methods);

		(function(div) {

		  if (!Prototype.BrowserFeatures.ElementExtensions && div['__proto__']) {
		    window.HTMLElement = { };
		    window.HTMLElement.prototype = div['__proto__'];
		    Prototype.BrowserFeatures.ElementExtensions = true;
		  }

		  div = null;

		})(document.createElement('div'))

		Element.extend = (function() {

		  function checkDeficiency(tagName) {
		    if (typeof window.Element != 'undefined') {
		      var proto = window.Element.prototype;
		      if (proto) {
		        var id = '_' + (Math.random()+'').slice(2);
		        var el = document.createElement(tagName);
		        proto[id] = 'x';
		        var isBuggy = (el[id] !== 'x');
		        delete proto[id];
		        el = null;
		        return isBuggy;
		      }
		    }
		    return false;
		  }

		  function extendElementWith(element, methods) {
		    for (var property in methods) {
		      var value = methods[property];
		      if (Object.isFunction(value) && !(property in element))
		        element[property] = value.methodize();
		    }
		  }

		  var HTMLOBJECTELEMENT_PROTOTYPE_BUGGY = checkDeficiency('object');

		  if (Prototype.BrowserFeatures.SpecificElementExtensions) {
		    if (HTMLOBJECTELEMENT_PROTOTYPE_BUGGY) {
		      return function(element) {
		        if (element && typeof element._extendedByPrototype == 'undefined') {
		          var t = element.tagName;
		          if (t && (/^(?:object|applet|embed)$/i.test(t))) {
		            extendElementWith(element, Element.Methods);
		            extendElementWith(element, Element.Methods.Simulated);
		            extendElementWith(element, Element.Methods.ByTag[t.toUpperCase()]);
		          }
		        }
		        return element;
		      }
		    }
		    return Prototype.K;
		  }

		  var Methods = { }, ByTag = Element.Methods.ByTag;

		  var extend = Object.extend(function(element) {
		    if (!element || typeof element._extendedByPrototype != 'undefined' ||
		        element.nodeType != 1 || element == window) return element;

		    var methods = Object.clone(Methods),
		        tagName = element.tagName.toUpperCase();

		    if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

		    extendElementWith(element, methods);

		    element._extendedByPrototype = Prototype.emptyFunction;
		    return element;

		  }, {
		    refresh: function() {
		      if (!Prototype.BrowserFeatures.ElementExtensions) {
		        Object.extend(Methods, Element.Methods);
		        Object.extend(Methods, Element.Methods.Simulated);
		      }
		    }
		  });

		  extend.refresh();
		  return extend;
		})();

		Element.hasAttribute = function(element, attribute) {
		  if (element.hasAttribute) return element.hasAttribute(attribute);
		  return Element.Methods.Simulated.hasAttribute(element, attribute);
		};

		Element.addMethods = function(methods) {
		  var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;

		  if (!methods) {
		    Object.extend(Form, Form.Methods);
		    Object.extend(Form.Element, Form.Element.Methods);
		    Object.extend(Element.Methods.ByTag, {
		      "FORM":     Object.clone(Form.Methods),
		      "INPUT":    Object.clone(Form.Element.Methods),
		      "SELECT":   Object.clone(Form.Element.Methods),
		      "TEXTAREA": Object.clone(Form.Element.Methods)
		    });
		  }

		  if (arguments.length == 2) {
		    var tagName = methods;
		    methods = arguments[1];
		  }

		  if (!tagName) Object.extend(Element.Methods, methods || { });
		  else {
		    if (Object.isArray(tagName)) tagName.each(extend);
		    else extend(tagName);
		  }

		  function extend(tagName) {
		    tagName = tagName.toUpperCase();
		    if (!Element.Methods.ByTag[tagName])
		      Element.Methods.ByTag[tagName] = { };
		    Object.extend(Element.Methods.ByTag[tagName], methods);
		  }

		  function copy(methods, destination, onlyIfAbsent) {
		    onlyIfAbsent = onlyIfAbsent || false;
		    for (var property in methods) {
		      var value = methods[property];
		      if (!Object.isFunction(value)) continue;
		      if (!onlyIfAbsent || !(property in destination))
		        destination[property] = value.methodize();
		    }
		  }

		  function findDOMClass(tagName) {
		    var klass;
		    var trans = {
		      "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
		      "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
		      "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
		      "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
		      "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
		      "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
		      "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
		      "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
		      "FrameSet", "IFRAME": "IFrame"
		    };
		    if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
		    if (window[klass]) return window[klass];
		    klass = 'HTML' + tagName + 'Element';
		    if (window[klass]) return window[klass];
		    klass = 'HTML' + tagName.capitalize() + 'Element';
		    if (window[klass]) return window[klass];

		    var element = document.createElement(tagName);
		    var proto = element['__proto__'] || element.constructor.prototype;
		    element = null;
		    return proto;
		  }

		  var elementPrototype = window.HTMLElement ? HTMLElement.prototype :
		   Element.prototype;

		  if (F.ElementExtensions) {
		    copy(Element.Methods, elementPrototype);
		    copy(Element.Methods.Simulated, elementPrototype, true);
		  }

		  if (F.SpecificElementExtensions) {
		    for (var tag in Element.Methods.ByTag) {
		      var klass = findDOMClass(tag);
		      if (Object.isUndefined(klass)) continue;
		      copy(T[tag], klass.prototype);
		    }
		  }

		  Object.extend(Element, Element.Methods);
		  delete Element.ByTag;

		  if (Element.extend.refresh) Element.extend.refresh();
		  Element.cache = { };
		};


		document.viewport = {

		  getDimensions: function() {
		    return { width: this.getWidth(), height: this.getHeight() };
		  },

		  getScrollOffsets: function() {
		    return Element._returnOffset(
		      window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
		      window.pageYOffset || document.documentElement.scrollTop  || document.body.scrollTop);
		  }
		};

		(function(viewport) {
		  var B = Prototype.Browser, doc = document, element, property = {};

		  function getRootElement() {
		    if (B.WebKit && !doc.evaluate)
		      return document;

		    if (B.Opera && window.parseFloat(window.opera.version()) < 9.5)
		      return document.body;

		    return document.documentElement;
		  }

		  function define(D) {
		    if (!element) element = getRootElement();

		    property[D] = 'client' + D;

		    viewport['get' + D] = function() { return element[property[D]] };
		    return viewport['get' + D]();
		  }

		  viewport.getWidth  = define.curry('Width');

		  viewport.getHeight = define.curry('Height');
		})(document.viewport);


		Element.Storage = {
		  UID: 1
		};

		Element.addMethods({
		  getStorage: function(element) {
		    if (!(element = $(element))) return;

		    var uid;
		    if (element === window) {
		      uid = 0;
		    } else {
		      if (typeof element._prototypeUID === "undefined")
		        element._prototypeUID = [Element.Storage.UID++];
		      uid = element._prototypeUID[0];
		    }

		    if (!Element.Storage[uid])
		      Element.Storage[uid] = $H();

		    return Element.Storage[uid];
		  },

		  store: function(element, key, value) {
		    if (!(element = $(element))) return;

		    if (arguments.length === 2) {
		      Element.getStorage(element).update(key);
		    } else {
		      Element.getStorage(element).set(key, value);
		    }

		    return element;
		  },

		  retrieve: function(element, key, defaultValue) {
		    if (!(element = $(element))) return;
		    var hash = Element.getStorage(element), value = hash.get(key);

		    if (Object.isUndefined(value)) {
		      hash.set(key, defaultValue);
		      value = defaultValue;
		    }

		    return value;
		  },

		  clone: function(element, deep) {
		    if (!(element = $(element))) return;
		    var clone = element.cloneNode(deep);
		    clone._prototypeUID = void 0;
		    if (deep) {
		      var descendants = Element.select(clone, '*'),
		          i = descendants.length;
		      while (i--) {
		        descendants[i]._prototypeUID = void 0;
		      }
		    }
		    return Element.extend(clone);
		  }
		});
		/* Portions of the Selector class are derived from Jack Slocum's DomQuery,
		 * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
		 * license.  Please see http://www.yui-ext.com/ for more information. */

		var Selector = Class.create({
		  initialize: function(expression) {
		    this.expression = expression.strip();

		    if (this.shouldUseSelectorsAPI()) {
		      this.mode = 'selectorsAPI';
		    } else if (this.shouldUseXPath()) {
		      this.mode = 'xpath';
		      this.compileXPathMatcher();
		    } else {
		      this.mode = "normal";
		      this.compileMatcher();
		    }

		  },

		  shouldUseXPath: (function() {

		    var IS_DESCENDANT_SELECTOR_BUGGY = (function(){
		      var isBuggy = false;
		      if (document.evaluate && window.XPathResult) {
		        var el = document.createElement('div');
		        el.innerHTML = '<ul><li></li></ul><div><ul><li></li></ul></div>';

		        var xpath = ".//*[local-name()='ul' or local-name()='UL']" +
		          "//*[local-name()='li' or local-name()='LI']";

		        var result = document.evaluate(xpath, el, null,
		          XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);

		        isBuggy = (result.snapshotLength !== 2);
		        el = null;
		      }
		      return isBuggy;
		    })();

		    return function() {
		      if (!Prototype.BrowserFeatures.XPath) return false;

		      var e = this.expression;

		      if (Prototype.Browser.WebKit &&
		       (e.include("-of-type") || e.include(":empty")))
		        return false;

		      if ((/(\[[\w-]*?:|:checked)/).test(e))
		        return false;

		      if (IS_DESCENDANT_SELECTOR_BUGGY) return false;

		      return true;
		    }

		  })(),

		  shouldUseSelectorsAPI: function() {
		    if (!Prototype.BrowserFeatures.SelectorsAPI) return false;

		    if (Selector.CASE_INSENSITIVE_CLASS_NAMES) return false;

		    if (!Selector._div) Selector._div = new Element('div');

		    try {
		      Selector._div.querySelector(this.expression);
		    } catch(e) {
		      return false;
		    }

		    return true;
		  },

		  compileMatcher: function() {
		    var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
		        c = Selector.criteria, le, p, m, len = ps.length, name;

		    if (Selector._cache[e]) {
		      this.matcher = Selector._cache[e];
		      return;
		    }

		    this.matcher = ["this.matcher = function(root) {",
		                    "var r = root, h = Selector.handlers, c = false, n;"];

		    while (e && le != e && (/\S/).test(e)) {
		      le = e;
		      for (var i = 0; i<len; i++) {
		        p = ps[i].re;
		        name = ps[i].name;
		        if (m = e.match(p)) {
		          this.matcher.push(Object.isFunction(c[name]) ? c[name](m) :
		            new Template(c[name]).evaluate(m));
		          e = e.replace(m[0], '');
		          break;
		        }
		      }
		    }

		    this.matcher.push("return h.unique(n);\n}");
		    eval(this.matcher.join('\n'));
		    Selector._cache[this.expression] = this.matcher;
		  },

		  compileXPathMatcher: function() {
		    var e = this.expression, ps = Selector.patterns,
		        x = Selector.xpath, le, m, len = ps.length, name;

		    if (Selector._cache[e]) {
		      this.xpath = Selector._cache[e]; return;
		    }

		    this.matcher = ['.//*'];
		    while (e && le != e && (/\S/).test(e)) {
		      le = e;
		      for (var i = 0; i<len; i++) {
		        name = ps[i].name;
		        if (m = e.match(ps[i].re)) {
		          this.matcher.push(Object.isFunction(x[name]) ? x[name](m) :
		            new Template(x[name]).evaluate(m));
		          e = e.replace(m[0], '');
		          break;
		        }
		      }
		    }

		    this.xpath = this.matcher.join('');
		    Selector._cache[this.expression] = this.xpath;
		  },

		  findElements: function(root) {
		    root = root || document;
		    var e = this.expression, results;

		    switch (this.mode) {
		      case 'selectorsAPI':
		        if (root !== document) {
		          var oldId = root.id, id = $(root).identify();
		          id = id.replace(/([\.:])/g, "\\$1");
		          e = "#" + id + " " + e;
		        }

		        results = $A(root.querySelectorAll(e)).map(Element.extend);
		        root.id = oldId;

		        return results;
		      case 'xpath':
		        return document._getElementsByXPath(this.xpath, root);
		      default:
		       return this.matcher(root);
		    }
		  },

		  match: function(element) {
		    this.tokens = [];

		    var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
		    var le, p, m, len = ps.length, name;

		    while (e && le !== e && (/\S/).test(e)) {
		      le = e;
		      for (var i = 0; i<len; i++) {
		        p = ps[i].re;
		        name = ps[i].name;
		        if (m = e.match(p)) {
		          if (as[name]) {
		            this.tokens.push([name, Object.clone(m)]);
		            e = e.replace(m[0], '');
		          } else {
		            return this.findElements(document).include(element);
		          }
		        }
		      }
		    }

		    var match = true, name, matches;
		    for (var i = 0, token; token = this.tokens[i]; i++) {
		      name = token[0], matches = token[1];
		      if (!Selector.assertions[name](element, matches)) {
		        match = false; break;
		      }
		    }

		    return match;
		  },

		  toString: function() {
		    return this.expression;
		  },

		  inspect: function() {
		    return "#<Selector:" + this.expression.inspect() + ">";
		  }
		});

		if (Prototype.BrowserFeatures.SelectorsAPI &&
		 document.compatMode === 'BackCompat') {
		  Selector.CASE_INSENSITIVE_CLASS_NAMES = (function(){
		    var div = document.createElement('div'),
		     span = document.createElement('span');

		    div.id = "prototype_test_id";
		    span.className = 'Test';
		    div.appendChild(span);
		    var isIgnored = (div.querySelector('#prototype_test_id .test') !== null);
		    div = span = null;
		    return isIgnored;
		  })();
		}

		Object.extend(Selector, {
		  _cache: { },

		  xpath: {
		    descendant:   "//*",
		    child:        "/*",
		    adjacent:     "/following-sibling::*[1]",
		    laterSibling: '/following-sibling::*',
		    tagName:      function(m) {
		      if (m[1] == '*') return '';
		      return "[local-name()='" + m[1].toLowerCase() +
		             "' or local-name()='" + m[1].toUpperCase() + "']";
		    },
		    className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
		    id:           "[@id='#{1}']",
		    attrPresence: function(m) {
		      m[1] = m[1].toLowerCase();
		      return new Template("[@#{1}]").evaluate(m);
		    },
		    attr: function(m) {
		      m[1] = m[1].toLowerCase();
		      m[3] = m[5] || m[6];
		      return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
		    },
		    pseudo: function(m) {
		      var h = Selector.xpath.pseudos[m[1]];
		      if (!h) return '';
		      if (Object.isFunction(h)) return h(m);
		      return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
		    },
		    operators: {
		      '=':  "[@#{1}='#{3}']",
		      '!=': "[@#{1}!='#{3}']",
		      '^=': "[starts-with(@#{1}, '#{3}')]",
		      '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
		      '*=': "[contains(@#{1}, '#{3}')]",
		      '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
		      '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
		    },
		    pseudos: {
		      'first-child': '[not(preceding-sibling::*)]',
		      'last-child':  '[not(following-sibling::*)]',
		      'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
		      'empty':       "[count(*) = 0 and (count(text()) = 0)]",
		      'checked':     "[@checked]",
		      'disabled':    "[(@disabled) and (@type!='hidden')]",
		      'enabled':     "[not(@disabled) and (@type!='hidden')]",
		      'not': function(m) {
		        var e = m[6], p = Selector.patterns,
		            x = Selector.xpath, le, v, len = p.length, name;

		        var exclusion = [];
		        while (e && le != e && (/\S/).test(e)) {
		          le = e;
		          for (var i = 0; i<len; i++) {
		            name = p[i].name
		            if (m = e.match(p[i].re)) {
		              v = Object.isFunction(x[name]) ? x[name](m) : new Template(x[name]).evaluate(m);
		              exclusion.push("(" + v.substring(1, v.length - 1) + ")");
		              e = e.replace(m[0], '');
		              break;
		            }
		          }
		        }
		        return "[not(" + exclusion.join(" and ") + ")]";
		      },
		      'nth-child':      function(m) {
		        return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
		      },
		      'nth-last-child': function(m) {
		        return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
		      },
		      'nth-of-type':    function(m) {
		        return Selector.xpath.pseudos.nth("position() ", m);
		      },
		      'nth-last-of-type': function(m) {
		        return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
		      },
		      'first-of-type':  function(m) {
		        m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
		      },
		      'last-of-type':   function(m) {
		        m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
		      },
		      'only-of-type':   function(m) {
		        var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
		      },
		      nth: function(fragment, m) {
		        var mm, formula = m[6], predicate;
		        if (formula == 'even') formula = '2n+0';
		        if (formula == 'odd')  formula = '2n+1';
		        if (mm = formula.match(/^(\d+)$/)) // digit only
		          return '[' + fragment + "= " + mm[1] + ']';
		        if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
		          if (mm[1] == "-") mm[1] = -1;
		          var a = mm[1] ? Number(mm[1]) : 1;
		          var b = mm[2] ? Number(mm[2]) : 0;
		          predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
		          "((#{fragment} - #{b}) div #{a} >= 0)]";
		          return new Template(predicate).evaluate({
		            fragment: fragment, a: a, b: b });
		        }
		      }
		    }
		  },

		  criteria: {
		    tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
		    className:    'n = h.className(n, r, "#{1}", c);    c = false;',
		    id:           'n = h.id(n, r, "#{1}", c);           c = false;',
		    attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
		    attr: function(m) {
		      m[3] = (m[5] || m[6]);
		      return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
		    },
		    pseudo: function(m) {
		      if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
		      return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
		    },
		    descendant:   'c = "descendant";',
		    child:        'c = "child";',
		    adjacent:     'c = "adjacent";',
		    laterSibling: 'c = "laterSibling";'
		  },

		  patterns: [
		    { name: 'laterSibling', re: /^\s*~\s*/ },
		    { name: 'child',        re: /^\s*>\s*/ },
		    { name: 'adjacent',     re: /^\s*\+\s*/ },
		    { name: 'descendant',   re: /^\s/ },

		    { name: 'tagName',      re: /^\s*(\*|[\w\-]+)(\b|$)?/ },
		    { name: 'id',           re: /^#([\w\-\*]+)(\b|$)/ },
		    { name: 'className',    re: /^\.([\w\-\*]+)(\b|$)/ },
		    { name: 'pseudo',       re: /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/ },
		    { name: 'attrPresence', re: /^\[((?:[\w-]+:)?[\w-]+)\]/ },
		    { name: 'attr',         re: /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/ }
		  ],

		  assertions: {
		    tagName: function(element, matches) {
		      return matches[1].toUpperCase() == element.tagName.toUpperCase();
		    },

		    className: function(element, matches) {
		      return Element.hasClassName(element, matches[1]);
		    },

		    id: function(element, matches) {
		      return element.id === matches[1];
		    },

		    attrPresence: function(element, matches) {
		      return Element.hasAttribute(element, matches[1]);
		    },

		    attr: function(element, matches) {
		      var nodeValue = Element.readAttribute(element, matches[1]);
		      return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
		    }
		  },

		  handlers: {
		    concat: function(a, b) {
		      for (var i = 0, node; node = b[i]; i++)
		        a.push(node);
		      return a;
		    },

		    mark: function(nodes) {
		      var _true = Prototype.emptyFunction;
		      for (var i = 0, node; node = nodes[i]; i++)
		        node._countedByPrototype = _true;
		      return nodes;
		    },

		    unmark: (function(){

		      var PROPERTIES_ATTRIBUTES_MAP = (function(){
		        var el = document.createElement('div'),
		            isBuggy = false,
		            propName = '_countedByPrototype',
		            value = 'x'
		        el[propName] = value;
		        isBuggy = (el.getAttribute(propName) === value);
		        el = null;
		        return isBuggy;
		      })();

		      return PROPERTIES_ATTRIBUTES_MAP ?
		        function(nodes) {
		          for (var i = 0, node; node = nodes[i]; i++)
		            node.removeAttribute('_countedByPrototype');
		          return nodes;
		        } :
		        function(nodes) {
		          for (var i = 0, node; node = nodes[i]; i++)
		            node._countedByPrototype = void 0;
		          return nodes;
		        }
		    })(),

		    index: function(parentNode, reverse, ofType) {
		      parentNode._countedByPrototype = Prototype.emptyFunction;
		      if (reverse) {
		        for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
		          var node = nodes[i];
		          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
		        }
		      } else {
		        for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
		          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
		      }
		    },

		    unique: function(nodes) {
		      if (nodes.length == 0) return nodes;
		      var results = [], n;
		      for (var i = 0, l = nodes.length; i < l; i++)
		        if (typeof (n = nodes[i])._countedByPrototype == 'undefined') {
		          n._countedByPrototype = Prototype.emptyFunction;
		          results.push(Element.extend(n));
		        }
		      return Selector.handlers.unmark(results);
		    },

		    descendant: function(nodes) {
		      var h = Selector.handlers;
		      for (var i = 0, results = [], node; node = nodes[i]; i++)
		        h.concat(results, node.getElementsByTagName('*'));
		      return results;
		    },

		    child: function(nodes) {
		      var h = Selector.handlers;
		      for (var i = 0, results = [], node; node = nodes[i]; i++) {
		        for (var j = 0, child; child = node.childNodes[j]; j++)
		          if (child.nodeType == 1 && child.tagName != '!') results.push(child);
		      }
		      return results;
		    },

		    adjacent: function(nodes) {
		      for (var i = 0, results = [], node; node = nodes[i]; i++) {
		        var next = this.nextElementSibling(node);
		        if (next) results.push(next);
		      }
		      return results;
		    },

		    laterSibling: function(nodes) {
		      var h = Selector.handlers;
		      for (var i = 0, results = [], node; node = nodes[i]; i++)
		        h.concat(results, Element.nextSiblings(node));
		      return results;
		    },

		    nextElementSibling: function(node) {
		      while (node = node.nextSibling)
		        if (node.nodeType == 1) return node;
		      return null;
		    },

		    previousElementSibling: function(node) {
		      while (node = node.previousSibling)
		        if (node.nodeType == 1) return node;
		      return null;
		    },

		    tagName: function(nodes, root, tagName, combinator) {
		      var uTagName = tagName.toUpperCase();
		      var results = [], h = Selector.handlers;
		      if (nodes) {
		        if (combinator) {
		          if (combinator == "descendant") {
		            for (var i = 0, node; node = nodes[i]; i++)
		              h.concat(results, node.getElementsByTagName(tagName));
		            return results;
		          } else nodes = this[combinator](nodes);
		          if (tagName == "*") return nodes;
		        }
		        for (var i = 0, node; node = nodes[i]; i++)
		          if (node.tagName.toUpperCase() === uTagName) results.push(node);
		        return results;
		      } else return root.getElementsByTagName(tagName);
		    },

		    id: function(nodes, root, id, combinator) {
		      var targetNode = $(id), h = Selector.handlers;

		      if (root == document) {
		        if (!targetNode) return [];
		        if (!nodes) return [targetNode];
		      } else {
		        if (!root.sourceIndex || root.sourceIndex < 1) {
		          var nodes = root.getElementsByTagName('*');
		          for (var j = 0, node; node = nodes[j]; j++) {
		            if (node.id === id) return [node];
		          }
		        }
		      }

		      if (nodes) {
		        if (combinator) {
		          if (combinator == 'child') {
		            for (var i = 0, node; node = nodes[i]; i++)
		              if (targetNode.parentNode == node) return [targetNode];
		          } else if (combinator == 'descendant') {
		            for (var i = 0, node; node = nodes[i]; i++)
		              if (Element.descendantOf(targetNode, node)) return [targetNode];
		          } else if (combinator == 'adjacent') {
		            for (var i = 0, node; node = nodes[i]; i++)
		              if (Selector.handlers.previousElementSibling(targetNode) == node)
		                return [targetNode];
		          } else nodes = h[combinator](nodes);
		        }
		        for (var i = 0, node; node = nodes[i]; i++)
		          if (node == targetNode) return [targetNode];
		        return [];
		      }
		      return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
		    },

		    className: function(nodes, root, className, combinator) {
		      if (nodes && combinator) nodes = this[combinator](nodes);
		      return Selector.handlers.byClassName(nodes, root, className);
		    },

		    byClassName: function(nodes, root, className) {
		      if (!nodes) nodes = Selector.handlers.descendant([root]);
		      var needle = ' ' + className + ' ';
		      for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
		        nodeClassName = node.className;
		        if (nodeClassName.length == 0) continue;
		        if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
		          results.push(node);
		      }
		      return results;
		    },

		    attrPresence: function(nodes, root, attr, combinator) {
		      if (!nodes) nodes = root.getElementsByTagName("*");
		      if (nodes && combinator) nodes = this[combinator](nodes);
		      var results = [];
		      for (var i = 0, node; node = nodes[i]; i++)
		        if (Element.hasAttribute(node, attr)) results.push(node);
		      return results;
		    },

		    attr: function(nodes, root, attr, value, operator, combinator) {
		      if (!nodes) nodes = root.getElementsByTagName("*");
		      if (nodes && combinator) nodes = this[combinator](nodes);
		      var handler = Selector.operators[operator], results = [];
		      for (var i = 0, node; node = nodes[i]; i++) {
		        var nodeValue = Element.readAttribute(node, attr);
		        if (nodeValue === null) continue;
		        if (handler(nodeValue, value)) results.push(node);
		      }
		      return results;
		    },

		    pseudo: function(nodes, name, value, root, combinator) {
		      if (nodes && combinator) nodes = this[combinator](nodes);
		      if (!nodes) nodes = root.getElementsByTagName("*");
		      return Selector.pseudos[name](nodes, value, root);
		    }
		  },

		  pseudos: {
		    'first-child': function(nodes, value, root) {
		      for (var i = 0, results = [], node; node = nodes[i]; i++) {
		        if (Selector.handlers.previousElementSibling(node)) continue;
		          results.push(node);
		      }
		      return results;
		    },
		    'last-child': function(nodes, value, root) {
		      for (var i = 0, results = [], node; node = nodes[i]; i++) {
		        if (Selector.handlers.nextElementSibling(node)) continue;
		          results.push(node);
		      }
		      return results;
		    },
		    'only-child': function(nodes, value, root) {
		      var h = Selector.handlers;
		      for (var i = 0, results = [], node; node = nodes[i]; i++)
		        if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
		          results.push(node);
		      return results;
		    },
		    'nth-child':        function(nodes, formula, root) {
		      return Selector.pseudos.nth(nodes, formula, root);
		    },
		    'nth-last-child':   function(nodes, formula, root) {
		      return Selector.pseudos.nth(nodes, formula, root, true);
		    },
		    'nth-of-type':      function(nodes, formula, root) {
		      return Selector.pseudos.nth(nodes, formula, root, false, true);
		    },
		    'nth-last-of-type': function(nodes, formula, root) {
		      return Selector.pseudos.nth(nodes, formula, root, true, true);
		    },
		    'first-of-type':    function(nodes, formula, root) {
		      return Selector.pseudos.nth(nodes, "1", root, false, true);
		    },
		    'last-of-type':     function(nodes, formula, root) {
		      return Selector.pseudos.nth(nodes, "1", root, true, true);
		    },
		    'only-of-type':     function(nodes, formula, root) {
		      var p = Selector.pseudos;
		      return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
		    },

		    getIndices: function(a, b, total) {
		      if (a == 0) return b > 0 ? [b] : [];
		      return $R(1, total).inject([], function(memo, i) {
		        if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
		        return memo;
		      });
		    },

		    nth: function(nodes, formula, root, reverse, ofType) {
		      if (nodes.length == 0) return [];
		      if (formula == 'even') formula = '2n+0';
		      if (formula == 'odd')  formula = '2n+1';
		      var h = Selector.handlers, results = [], indexed = [], m;
		      h.mark(nodes);
		      for (var i = 0, node; node = nodes[i]; i++) {
		        if (!node.parentNode._countedByPrototype) {
		          h.index(node.parentNode, reverse, ofType);
		          indexed.push(node.parentNode);
		        }
		      }
		      if (formula.match(/^\d+$/)) { // just a number
		        formula = Number(formula);
		        for (var i = 0, node; node = nodes[i]; i++)
		          if (node.nodeIndex == formula) results.push(node);
		      } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
		        if (m[1] == "-") m[1] = -1;
		        var a = m[1] ? Number(m[1]) : 1;
		        var b = m[2] ? Number(m[2]) : 0;
		        var indices = Selector.pseudos.getIndices(a, b, nodes.length);
		        for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
		          for (var j = 0; j < l; j++)
		            if (node.nodeIndex == indices[j]) results.push(node);
		        }
		      }
		      h.unmark(nodes);
		      h.unmark(indexed);
		      return results;
		    },

		    'empty': function(nodes, value, root) {
		      for (var i = 0, results = [], node; node = nodes[i]; i++) {
		        if (node.tagName == '!' || node.firstChild) continue;
		        results.push(node);
		      }
		      return results;
		    },

		    'not': function(nodes, selector, root) {
		      var h = Selector.handlers, selectorType, m;
		      var exclusions = new Selector(selector).findElements(root);
		      h.mark(exclusions);
		      for (var i = 0, results = [], node; node = nodes[i]; i++)
		        if (!node._countedByPrototype) results.push(node);
		      h.unmark(exclusions);
		      return results;
		    },

		    'enabled': function(nodes, value, root) {
		      for (var i = 0, results = [], node; node = nodes[i]; i++)
		        if (!node.disabled && (!node.type || node.type !== 'hidden'))
		          results.push(node);
		      return results;
		    },

		    'disabled': function(nodes, value, root) {
		      for (var i = 0, results = [], node; node = nodes[i]; i++)
		        if (node.disabled) results.push(node);
		      return results;
		    },

		    'checked': function(nodes, value, root) {
		      for (var i = 0, results = [], node; node = nodes[i]; i++)
		        if (node.checked) results.push(node);
		      return results;
		    }
		  },

		  operators: {
		    '=':  function(nv, v) { return nv == v; },
		    '!=': function(nv, v) { return nv != v; },
		    '^=': function(nv, v) { return nv == v || nv && nv.startsWith(v); },
		    '$=': function(nv, v) { return nv == v || nv && nv.endsWith(v); },
		    '*=': function(nv, v) { return nv == v || nv && nv.include(v); },
		    '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
		    '|=': function(nv, v) { return ('-' + (nv || "").toUpperCase() +
		     '-').include('-' + (v || "").toUpperCase() + '-'); }
		  },

		  split: function(expression) {
		    var expressions = [];
		    expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
		      expressions.push(m[1].strip());
		    });
		    return expressions;
		  },

		  matchElements: function(elements, expression) {
		    var matches = $$(expression), h = Selector.handlers;
		    h.mark(matches);
		    for (var i = 0, results = [], element; element = elements[i]; i++)
		      if (element._countedByPrototype) results.push(element);
		    h.unmark(matches);
		    return results;
		  },

		  findElement: function(elements, expression, index) {
		    if (Object.isNumber(expression)) {
		      index = expression; expression = false;
		    }
		    return Selector.matchElements(elements, expression || '*')[index || 0];
		  },

		  findChildElements: function(element, expressions) {
		    expressions = Selector.split(expressions.join(','));
		    var results = [], h = Selector.handlers;
		    for (var i = 0, l = expressions.length, selector; i < l; i++) {
		      selector = new Selector(expressions[i].strip());
		      h.concat(results, selector.findElements(element));
		    }
		    return (l > 1) ? h.unique(results) : results;
		  }
		});

		if (Prototype.Browser.IE) {
		  Object.extend(Selector.handlers, {
		    concat: function(a, b) {
		      for (var i = 0, node; node = b[i]; i++)
		        if (node.tagName !== "!") a.push(node);
		      return a;
		    }
		  });
		}

		var Form = {
		  reset: function(form) {
		    form = $(form);
		    form.reset();
		    return form;
		  },

		  serializeElements: function(elements, options) {
		    if (typeof options != 'object') options = { hash: !!options };
		    else if (Object.isUndefined(options.hash)) options.hash = true;
		    var key, value, submitted = false, submit = options.submit;

		    var data = elements.inject({ }, function(result, element) {
		      if (!element.disabled && element.name) {
		        key = element.name; value = $(element).getValue();
		        if (value != null && element.type != 'file' && (element.type != 'submit' || (!submitted &&
		            submit !== false && (!submit || key == submit) && (submitted = true)))) {
		          if (key in result) {
		            if (!Object.isArray(result[key])) result[key] = [result[key]];
		            result[key].push(value);
		          }
		          else result[key] = value;
		        }
		      }
		      return result;
		    });

		    return options.hash ? data : Object.toQueryString(data);
		  }
		};

		Form.Methods = {
		  serialize: function(form, options) {
		    return Form.serializeElements(Form.getElements(form), options);
		  },

		  getElements: function(form) {
		    var elements = $(form).getElementsByTagName('*'),
		        element,
		        arr = [ ],
		        serializers = Form.Element.Serializers;
		    for (var i = 0; element = elements[i]; i++) {
		      arr.push(element);
		    }
		    return arr.inject([], function(elements, child) {
		      if (serializers[child.tagName.toLowerCase()])
		        elements.push(Element.extend(child));
		      return elements;
		    })
		  },

		  getInputs: function(form, typeName, name) {
		    form = $(form);
		    var inputs = form.getElementsByTagName('input');

		    if (!typeName && !name) return $A(inputs).map(Element.extend);

		    for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
		      var input = inputs[i];
		      if ((typeName && input.type != typeName) || (name && input.name != name))
		        continue;
		      matchingInputs.push(Element.extend(input));
		    }

		    return matchingInputs;
		  },

		  disable: function(form) {
		    form = $(form);
		    Form.getElements(form).invoke('disable');
		    return form;
		  },

		  enable: function(form) {
		    form = $(form);
		    Form.getElements(form).invoke('enable');
		    return form;
		  },

		  findFirstElement: function(form) {
		    var elements = $(form).getElements().findAll(function(element) {
		      return 'hidden' != element.type && !element.disabled;
		    });
		    var firstByIndex = elements.findAll(function(element) {
		      return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
		    }).sortBy(function(element) { return element.tabIndex }).first();

		    return firstByIndex ? firstByIndex : elements.find(function(element) {
		      return /^(?:input|select|textarea)$/i.test(element.tagName);
		    });
		  },

		  focusFirstElement: function(form) {
		    form = $(form);
		    form.findFirstElement().activate();
		    return form;
		  },

		  request: function(form, options) {
		    form = $(form), options = Object.clone(options || { });

		    var params = options.parameters, action = form.readAttribute('action') || '';
		    if (action.blank()) action = window.location.href;
		    options.parameters = form.serialize(true);

		    if (params) {
		      if (Object.isString(params)) params = params.toQueryParams();
		      Object.extend(options.parameters, params);
		    }

		    if (form.hasAttribute('method') && !options.method)
		      options.method = form.method;

		    return new Ajax.Request(action, options);
		  }
		};

		/*--------------------------------------------------------------------------*/


		Form.Element = {
		  focus: function(element) {
		    $(element).focus();
		    return element;
		  },

		  select: function(element) {
		    $(element).select();
		    return element;
		  }
		};

		Form.Element.Methods = {

		  serialize: function(element) {
		    element = $(element);
		    if (!element.disabled && element.name) {
		      var value = element.getValue();
		      if (value != undefined) {
		        var pair = { };
		        pair[element.name] = value;
		        return Object.toQueryString(pair);
		      }
		    }
		    return '';
		  },

		  getValue: function(element) {
		    element = $(element);
		    var method = element.tagName.toLowerCase();
		    return Form.Element.Serializers[method](element);
		  },

		  setValue: function(element, value) {
		    element = $(element);
		    var method = element.tagName.toLowerCase();
		    Form.Element.Serializers[method](element, value);
		    return element;
		  },

		  clear: function(element) {
		    $(element).value = '';
		    return element;
		  },

		  present: function(element) {
		    return $(element).value != '';
		  },

		  activate: function(element) {
		    element = $(element);
		    try {
		      element.focus();
		      if (element.select && (element.tagName.toLowerCase() != 'input' ||
		          !(/^(?:button|reset|submit)$/i.test(element.type))))
		        element.select();
		    } catch (e) { }
		    return element;
		  },

		  disable: function(element) {
		    element = $(element);
		    element.disabled = true;
		    return element;
		  },

		  enable: function(element) {
		    element = $(element);
		    element.disabled = false;
		    return element;
		  }
		};

		/*--------------------------------------------------------------------------*/

		var Field = Form.Element;

		var $F = Form.Element.Methods.getValue;

		/*--------------------------------------------------------------------------*/

		Form.Element.Serializers = {
		  input: function(element, value) {
		    switch (element.type.toLowerCase()) {
		      case 'checkbox':
		      case 'radio':
		        return Form.Element.Serializers.inputSelector(element, value);
		      default:
		        return Form.Element.Serializers.textarea(element, value);
		    }
		  },

		  inputSelector: function(element, value) {
		    if (Object.isUndefined(value)) return element.checked ? element.value : null;
		    else element.checked = !!value;
		  },

		  textarea: function(element, value) {
		    if (Object.isUndefined(value)) return element.value;
		    else element.value = value;
		  },

		  select: function(element, value) {
		    if (Object.isUndefined(value))
		      return this[element.type == 'select-one' ?
		        'selectOne' : 'selectMany'](element);
		    else {
		      var opt, currentValue, single = !Object.isArray(value);
		      for (var i = 0, length = element.length; i < length; i++) {
		        opt = element.options[i];
		        currentValue = this.optionValue(opt);
		        if (single) {
		          if (currentValue == value) {
		            opt.selected = true;
		            return;
		          }
		        }
		        else opt.selected = value.include(currentValue);
		      }
		    }
		  },

		  selectOne: function(element) {
		    var index = element.selectedIndex;
		    return index >= 0 ? this.optionValue(element.options[index]) : null;
		  },

		  selectMany: function(element) {
		    var values, length = element.length;
		    if (!length) return null;

		    for (var i = 0, values = []; i < length; i++) {
		      var opt = element.options[i];
		      if (opt.selected) values.push(this.optionValue(opt));
		    }
		    return values;
		  },

		  optionValue: function(opt) {
		    return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
		  }
		};

		/*--------------------------------------------------------------------------*/


		Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
		  initialize: function($super, element, frequency, callback) {
		    $super(callback, frequency);
		    this.element   = $(element);
		    this.lastValue = this.getValue();
		  },

		  execute: function() {
		    var value = this.getValue();
		    if (Object.isString(this.lastValue) && Object.isString(value) ?
		        this.lastValue != value : String(this.lastValue) != String(value)) {
		      this.callback(this.element, value);
		      this.lastValue = value;
		    }
		  }
		});

		Form.Element.Observer = Class.create(Abstract.TimedObserver, {
		  getValue: function() {
		    return Form.Element.getValue(this.element);
		  }
		});

		Form.Observer = Class.create(Abstract.TimedObserver, {
		  getValue: function() {
		    return Form.serialize(this.element);
		  }
		});

		/*--------------------------------------------------------------------------*/

		Abstract.EventObserver = Class.create({
		  initialize: function(element, callback) {
		    this.element  = $(element);
		    this.callback = callback;

		    this.lastValue = this.getValue();
		    if (this.element.tagName.toLowerCase() == 'form')
		      this.registerFormCallbacks();
		    else
		      this.registerCallback(this.element);
		  },

		  onElementEvent: function() {
		    var value = this.getValue();
		    if (this.lastValue != value) {
		      this.callback(this.element, value);
		      this.lastValue = value;
		    }
		  },

		  registerFormCallbacks: function() {
		    Form.getElements(this.element).each(this.registerCallback, this);
		  },

		  registerCallback: function(element) {
		    if (element.type) {
		      switch (element.type.toLowerCase()) {
		        case 'checkbox':
		        case 'radio':
		          Event.observe(element, 'click', this.onElementEvent.bind(this));
		          break;
		        default:
		          Event.observe(element, 'change', this.onElementEvent.bind(this));
		          break;
		      }
		    }
		  }
		});

		Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
		  getValue: function() {
		    return Form.Element.getValue(this.element);
		  }
		});

		Form.EventObserver = Class.create(Abstract.EventObserver, {
		  getValue: function() {
		    return Form.serialize(this.element);
		  }
		});
		(function() {

		  var Event = {
		    KEY_BACKSPACE: 8,
		    KEY_TAB:       9,
		    KEY_RETURN:   13,
		    KEY_ESC:      27,
		    KEY_LEFT:     37,
		    KEY_UP:       38,
		    KEY_RIGHT:    39,
		    KEY_DOWN:     40,
		    KEY_DELETE:   46,
		    KEY_HOME:     36,
		    KEY_END:      35,
		    KEY_PAGEUP:   33,
		    KEY_PAGEDOWN: 34,
		    KEY_INSERT:   45,

		    cache: {}
		  };

		  var docEl = document.documentElement;
		  var MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED = 'onmouseenter' in docEl
		    && 'onmouseleave' in docEl;

		  var _isButton;
		  if (Prototype.Browser.IE) {
		    var buttonMap = { 0: 1, 1: 4, 2: 2 };
		    _isButton = function(event, code) {
		      return event.button === buttonMap[code];
		    };
		  } else if (Prototype.Browser.WebKit) {
		    _isButton = function(event, code) {
		      switch (code) {
		        case 0: return event.which == 1 && !event.metaKey;
		        case 1: return event.which == 1 && event.metaKey;
		        default: return false;
		      }
		    };
		  } else {
		    _isButton = function(event, code) {
		      return event.which ? (event.which === code + 1) : (event.button === code);
		    };
		  }

		  function isLeftClick(event)   { return _isButton(event, 0) }

		  function isMiddleClick(event) { return _isButton(event, 1) }

		  function isRightClick(event)  { return _isButton(event, 2) }

		  function element(event) {
		    event = Event.extend(event);

		    var node = event.target, type = event.type,
		     currentTarget = event.currentTarget;

		    if (currentTarget && currentTarget.tagName) {
		      if (type === 'load' || type === 'error' ||
		        (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
		          && currentTarget.type === 'radio'))
		            node = currentTarget;
		    }

		    if (node.nodeType == Node.TEXT_NODE)
		      node = node.parentNode;

		    return Element.extend(node);
		  }

		  function findElement(event, expression) {
		    var element = Event.element(event);
		    if (!expression) return element;
		    var elements = [element].concat(element.ancestors());
		    return Selector.findElement(elements, expression, 0);
		  }

		  function pointer(event) {
		    return { x: pointerX(event), y: pointerY(event) };
		  }

		  function pointerX(event) {
		    var docElement = document.documentElement,
		     body = document.body || { scrollLeft: 0 };

		    return event.pageX || (event.clientX +
		      (docElement.scrollLeft || body.scrollLeft) -
		      (docElement.clientLeft || 0));
		  }

		  function pointerY(event) {
		    var docElement = document.documentElement,
		     body = document.body || { scrollTop: 0 };

		    return  event.pageY || (event.clientY +
		       (docElement.scrollTop || body.scrollTop) -
		       (docElement.clientTop || 0));
		  }


		  function stop(event) {
		    Event.extend(event);
		    event.preventDefault();
		    event.stopPropagation();

		    event.stopped = true;
		  }

		  Event.Methods = {
		    isLeftClick: isLeftClick,
		    isMiddleClick: isMiddleClick,
		    isRightClick: isRightClick,

		    element: element,
		    findElement: findElement,

		    pointer: pointer,
		    pointerX: pointerX,
		    pointerY: pointerY,

		    stop: stop
		  };


		  var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
		    m[name] = Event.Methods[name].methodize();
		    return m;
		  });

		  if (Prototype.Browser.IE) {
		    function _relatedTarget(event) {
		      var element;
		      switch (event.type) {
		        case 'mouseover': element = event.fromElement; break;
		        case 'mouseout':  element = event.toElement;   break;
		        default: return null;
		      }
		      return Element.extend(element);
		    }

		    Object.extend(methods, {
		      stopPropagation: function() { this.cancelBubble = true },
		      preventDefault:  function() { this.returnValue = false },
		      inspect: function() { return '[object Event]' }
		    });

		    Event.extend = function(event, element) {
		      if (!event) return false;
		      if (event._extendedByPrototype) return event;

		      event._extendedByPrototype = Prototype.emptyFunction;
		      var pointer = Event.pointer(event);

		      Object.extend(event, {
		        target: event.srcElement || element,
		        relatedTarget: _relatedTarget(event),
		        pageX:  pointer.x,
		        pageY:  pointer.y
		      });

		      return Object.extend(event, methods);
		    };
		  } else {
		    Event.prototype = window.Event.prototype || document.createEvent('HTMLEvents').__proto__;
		    Object.extend(Event.prototype, methods);
		    Event.extend = Prototype.K;
		  }

		  function _createResponder(element, eventName, handler) {
		    var registry = Element.retrieve(element, 'prototype_event_registry');

		    if (Object.isUndefined(registry)) {
		      CACHE.push(element);
		      registry = Element.retrieve(element, 'prototype_event_registry', $H());
		    }

		    var respondersForEvent = registry.get(eventName);
		    if (Object.isUndefined(respondersForEvent)) {
		      respondersForEvent = [];
		      registry.set(eventName, respondersForEvent);
		    }

		    if (respondersForEvent.pluck('handler').include(handler)) return false;

		    var responder;
		    if (eventName.include(":")) {
		      responder = function(event) {
		        if (Object.isUndefined(event.eventName))
		          return false;

		        if (event.eventName !== eventName)
		          return false;

		        Event.extend(event, element);
		        handler.call(element, event);
		      };
		    } else {
		      if (!MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED &&
		       (eventName === "mouseenter" || eventName === "mouseleave")) {
		        if (eventName === "mouseenter" || eventName === "mouseleave") {
		          responder = function(event) {
		            Event.extend(event, element);

		            var parent = event.relatedTarget;
		            while (parent && parent !== element) {
		              try { parent = parent.parentNode; }
		              catch(e) { parent = element; }
		            }

		            if (parent === element) return;

		            handler.call(element, event);
		          };
		        }
		      } else {
		        responder = function(event) {
		          Event.extend(event, element);
		          handler.call(element, event);
		        };
		      }
		    }

		    responder.handler = handler;
		    respondersForEvent.push(responder);
		    return responder;
		  }

		  function _destroyCache() {
		    for (var i = 0, length = CACHE.length; i < length; i++) {
		      Event.stopObserving(CACHE[i]);
		      CACHE[i] = null;
		    }
		  }

		  var CACHE = [];

		  if (Prototype.Browser.IE)
		    window.attachEvent('onunload', _destroyCache);

		  if (Prototype.Browser.WebKit)
		    window.addEventListener('unload', Prototype.emptyFunction, false);


		  var _getDOMEventName = Prototype.K;

		  if (!MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED) {
		    _getDOMEventName = function(eventName) {
		      var translations = { mouseenter: "mouseover", mouseleave: "mouseout" };
		      return eventName in translations ? translations[eventName] : eventName;
		    };
		  }

		  function observe(element, eventName, handler) {
		    element = $(element);

		    var responder = _createResponder(element, eventName, handler);

		    if (!responder) return element;

		    if (eventName.include(':')) {
		      if (element.addEventListener)
		        element.addEventListener("dataavailable", responder, false);
		      else {
		        element.attachEvent("ondataavailable", responder);
		        element.attachEvent("onfilterchange", responder);
		      }
		    } else {
		      var actualEventName = _getDOMEventName(eventName);

		      if (element.addEventListener)
		        element.addEventListener(actualEventName, responder, false);
		      else
		        element.attachEvent("on" + actualEventName, responder);
		    }

		    return element;
		  }

		  function stopObserving(element, eventName, handler) {
		    element = $(element);

		    var registry = Element.retrieve(element, 'prototype_event_registry');

		    if (Object.isUndefined(registry)) return element;

		    if (eventName && !handler) {
		      var responders = registry.get(eventName);

		      if (Object.isUndefined(responders)) return element;

		      responders.each( function(r) {
		        Element.stopObserving(element, eventName, r.handler);
		      });
		      return element;
		    } else if (!eventName) {
		      registry.each( function(pair) {
		        var eventName = pair.key, responders = pair.value;

		        responders.each( function(r) {
		          Element.stopObserving(element, eventName, r.handler);
		        });
		      });
		      return element;
		    }

		    var responders = registry.get(eventName);

		    if (!responders) return;

		    var responder = responders.find( function(r) { return r.handler === handler; });
		    if (!responder) return element;

		    var actualEventName = _getDOMEventName(eventName);

		    if (eventName.include(':')) {
		      if (element.removeEventListener)
		        element.removeEventListener("dataavailable", responder, false);
		      else {
		        element.detachEvent("ondataavailable", responder);
		        element.detachEvent("onfilterchange",  responder);
		      }
		    } else {
		      if (element.removeEventListener)
		        element.removeEventListener(actualEventName, responder, false);
		      else
		        element.detachEvent('on' + actualEventName, responder);
		    }

		    registry.set(eventName, responders.without(responder));

		    return element;
		  }

		  function fire(element, eventName, memo, bubble) {
		    element = $(element);

		    if (Object.isUndefined(bubble))
		      bubble = true;

		    if (element == document && document.createEvent && !element.dispatchEvent)
		      element = document.documentElement;

		    var event;
		    if (document.createEvent) {
		      event = document.createEvent('HTMLEvents');
		      event.initEvent('dataavailable', true, true);
		    } else {
		      event = document.createEventObject();
		      event.eventType = bubble ? 'ondataavailable' : 'onfilterchange';
		    }

		    event.eventName = eventName;
		    event.memo = memo || { };

		    if (document.createEvent)
		      element.dispatchEvent(event);
		    else
		      element.fireEvent(event.eventType, event);

		    return Event.extend(event);
		  }


		  Object.extend(Event, Event.Methods);

		  Object.extend(Event, {
		    fire:          fire,
		    observe:       observe,
		    stopObserving: stopObserving
		  });

		  Element.addMethods({
		    fire:          fire,

		    observe:       observe,

		    stopObserving: stopObserving
		  });

		  Object.extend(document, {
		    fire:          fire.methodize(),

		    observe:       observe.methodize(),

		    stopObserving: stopObserving.methodize(),

		    loaded:        false
		  });

		  if (window.Event) Object.extend(window.Event, Event);
		  else window.Event = Event;
		})();

		(function() {
		  /* Support for the DOMContentLoaded event is based on work by Dan Webb,
		     Matthias Miller, Dean Edwards, John Resig, and Diego Perini. */

		  var timer;

		  function fireContentLoadedEvent() {
		    if (document.loaded) return;
		    if (timer) window.clearTimeout(timer);
		    document.loaded = true;
		    document.fire('dom:loaded');
		  }

		  function checkReadyState() {
		    if (document.readyState === 'complete') {
		      document.stopObserving('readystatechange', checkReadyState);
		      fireContentLoadedEvent();
		    }
		  }

		  function pollDoScroll() {
		    try { document.documentElement.doScroll('left'); }
		    catch(e) {
		      timer = pollDoScroll.defer();
		      return;
		    }
		    fireContentLoadedEvent();
		  }

		  if (document.addEventListener) {
		    document.addEventListener('DOMContentLoaded', fireContentLoadedEvent, false);
		  } else {
		    document.observe('readystatechange', checkReadyState);
		    if (window == top)
		      timer = pollDoScroll.defer();
		  }

		  Event.observe(window, 'load', fireContentLoadedEvent);
		})();

		Element.addMethods();

		/*------------------------------- DEPRECATED -------------------------------*/

		Hash.toQueryString = Object.toQueryString;

		var Toggle = { display: Element.toggle };

		Element.Methods.childOf = Element.Methods.descendantOf;

		var Insertion = {
		  Before: function(element, content) {
		    return Element.insert(element, {before:content});
		  },

		  Top: function(element, content) {
		    return Element.insert(element, {top:content});
		  },

		  Bottom: function(element, content) {
		    return Element.insert(element, {bottom:content});
		  },

		  After: function(element, content) {
		    return Element.insert(element, {after:content});
		  }
		};

		var $continue = new Error('"throw $continue" is deprecated, use "return" instead');

		var Position = {
		  includeScrollOffsets: false,

		  prepare: function() {
		    this.deltaX =  window.pageXOffset
		                || document.documentElement.scrollLeft
		                || document.body.scrollLeft
		                || 0;
		    this.deltaY =  window.pageYOffset
		                || document.documentElement.scrollTop
		                || document.body.scrollTop
		                || 0;
		  },

		  within: function(element, x, y) {
		    if (this.includeScrollOffsets)
		      return this.withinIncludingScrolloffsets(element, x, y);
		    this.xcomp = x;
		    this.ycomp = y;
		    this.offset = Element.cumulativeOffset(element);

		    return (y >= this.offset[1] &&
		            y <  this.offset[1] + element.offsetHeight &&
		            x >= this.offset[0] &&
		            x <  this.offset[0] + element.offsetWidth);
		  },

		  withinIncludingScrolloffsets: function(element, x, y) {
		    var offsetcache = Element.cumulativeScrollOffset(element);

		    this.xcomp = x + offsetcache[0] - this.deltaX;
		    this.ycomp = y + offsetcache[1] - this.deltaY;
		    this.offset = Element.cumulativeOffset(element);

		    return (this.ycomp >= this.offset[1] &&
		            this.ycomp <  this.offset[1] + element.offsetHeight &&
		            this.xcomp >= this.offset[0] &&
		            this.xcomp <  this.offset[0] + element.offsetWidth);
		  },

		  overlap: function(mode, element) {
		    if (!mode) return 0;
		    if (mode == 'vertical')
		      return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
		        element.offsetHeight;
		    if (mode == 'horizontal')
		      return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
		        element.offsetWidth;
		  },


		  cumulativeOffset: Element.Methods.cumulativeOffset,

		  positionedOffset: Element.Methods.positionedOffset,

		  absolutize: function(element) {
		    Position.prepare();
		    return Element.absolutize(element);
		  },

		  relativize: function(element) {
		    Position.prepare();
		    return Element.relativize(element);
		  },

		  realOffset: Element.Methods.cumulativeScrollOffset,

		  offsetParent: Element.Methods.getOffsetParent,

		  page: Element.Methods.viewportOffset,

		  clone: function(source, target, options) {
		    options = options || { };
		    return Element.clonePosition(target, source, options);
		  }
		};

		/*--------------------------------------------------------------------------*/

		if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
		  function iter(name) {
		    return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
		  }

		  instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
		  function(element, className) {
		    className = className.toString().strip();
		    var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
		    return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
		  } : function(element, className) {
		    className = className.toString().strip();
		    var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
		    if (!classNames && !className) return elements;

		    var nodes = $(element).getElementsByTagName('*');
		    className = ' ' + className + ' ';

		    for (var i = 0, child, cn; child = nodes[i]; i++) {
		      if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
		          (classNames && classNames.all(function(name) {
		            return !name.toString().blank() && cn.include(' ' + name + ' ');
		          }))))
		        elements.push(Element.extend(child));
		    }
		    return elements;
		  };

		  return function(className, parentElement) {
		    return $(parentElement || document.body).getElementsByClassName(className);
		  };
		}(Element.Methods);

		/*--------------------------------------------------------------------------*/

		Element.ClassNames = Class.create();
		Element.ClassNames.prototype = {
		  initialize: function(element) {
		    this.element = $(element);
		  },

		  _each: function(iterator) {
		    this.element.className.split(/\s+/).select(function(name) {
		      return name.length > 0;
		    })._each(iterator);
		  },

		  set: function(className) {
		    this.element.className = className;
		  },

		  add: function(classNameToAdd) {
		    if (this.include(classNameToAdd)) return;
		    this.set($A(this).concat(classNameToAdd).join(' '));
		  },

		  remove: function(classNameToRemove) {
		    if (!this.include(classNameToRemove)) return;
		    this.set($A(this).without(classNameToRemove).join(' '));
		  },

		  toString: function() {
		    return $A(this).join(' ');
		  }
		};

		Object.extend(Element.ClassNames.prototype, Enumerable);
}

VersionManager.complete('1.6.1');