PIE_open.js

/**
 * Simple utility for merging objects
 * @param {Object} obj1 The main object into which all others will be merged
 * @param {...Object} var_args Other objects which will be merged into the first, in order
 */
PIE.merge = function( obj1 ) {
    var i, len, p, objN, args = arguments;
    for( i = 1, len = args.length; i < len; i++ ) {
        objN = args[i];
        for( p in objN ) {
            if( objN.hasOwnProperty( p ) ) {
                obj1[ p ] = objN[ p ];
            }
        }
    }
    return obj1;
};


PIE.merge(PIE, {

    // Constants
    CSS_PREFIX: '-pie-',
    STYLE_PREFIX: 'Pie',
    CLASS_PREFIX: 'pie_',

    tableCellTags: {
        'TD': 1,
        'TH': 1
    },

    /**
     * Lookup table of elements which cannot take custom children.
     */
    childlessElements: {
        'TABLE':1,
        'THEAD':1,
        'TBODY':1,
        'TFOOT':1,
        'TR':1,
        'INPUT':1,
        'TEXTAREA':1,
        'SELECT':1,
        'OPTION':1,
        'IMG':1,
        'HR':1
    },

    /**
     * Elements that can receive user focus
     */
    focusableElements: {
        'A':1,
        'INPUT':1,
        'TEXTAREA':1,
        'SELECT':1,
        'BUTTON':1
    },

    /**
     * Values of the type attribute for input elements displayed as buttons
     */
    inputButtonTypes: {
        'submit':1,
        'button':1,
        'reset':1
    },

    emptyFn: function() {}
});

// Force the background cache to be used. No reason it shouldn't be.
try {
    doc.execCommand( 'BackgroundImageCache', false, true );
} catch(e) {}

(function() {
    /*
     * IE version detection approach by James Padolsey, with modifications -- from
     * http://james.padolsey.com/javascript/detect-ie-in-js-using-conditional-comments/
     */
    var ieVersion = 4,
        div = doc.createElement('div'),
        all = div.getElementsByTagName('i'),
        shape;
    while (
        div.innerHTML = '<!--[if gt IE ' + (++ieVersion) + ']><i></i><![endif]-->',
        all[0]
    ) {}
    PIE.ieVersion = ieVersion;

    // Detect IE6
    if( ieVersion === 6 ) {
        // IE6 can't access properties with leading dash, but can without it.
        PIE.CSS_PREFIX = PIE.CSS_PREFIX.replace( /^-/, '' );
    }

    PIE.ieDocMode = doc.documentMode || PIE.ieVersion;

    // Detect VML support (a small number of IE installs don't have a working VML engine)
    div.innerHTML = '<v:shape adj="1"/>';
    shape = div.firstChild;
    shape.style['behavior'] = 'url(#default#VML)';
    PIE.supportsVML = (typeof shape['adj'] === "object");
})();