Fix selenium webrat tests in FF/Safari -- locatedLabel.htmlFor return…

…s empty string in FF/Safari which breaks location strategy for label

lib/webrat/selenium/location_strategy_javascript/label.js

@@ -10,7 +10,7 @@ RegExp.escape = function(text) {
     );
   }
   return text.replace(arguments.callee.sRE, '\\$1');
-}
+};
 
 var allLabels = inDocument.getElementsByTagName("label");
 var regExp = new RegExp('^\\W*' + RegExp.escape(locator) + '(\\b|$)', 'i');
@@ -30,7 +30,13 @@ candidateLabels = candidateLabels.sortBy(function(s) {
 });
 
 var locatedLabel = candidateLabels.first();
-var labelFor = locatedLabel.getAttribute('for') || locatedLabel.htmlFor;
+var labelFor = null;
+
+if (locatedLabel.getAttribute('for')) {
+  labelFor = locatedLabel.getAttribute('for');
+} else if (locatedLabel.attributes['for']) { // IE
+  labelFor = locatedLabel.attributes['for'].nodeValue;
+}
 
 if ((labelFor == null) && (locatedLabel.hasChildNodes())) {
   return locatedLabel.getElementsByTagName('button')[0]