rem: return s.replace(/^url\(/i, "").replace(/\)$/, ""); 
add: return isInvalid(s) ? "" : s.replace(/^url\(/i, "").replace(/\)$/, ""); 
context: proto._evalBackgroundImage = function(){  var s = this.getStyleProperty("backgroundImage");  return s.replace(/^url\(/i, "").replace(/\)$/, "");};
meta: 1005	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1005/fd3896b1648d5d0a8930abb9c15aaa9fb7c67458/QxWidget.js/clean/qooxdoo/source/script/widgets/QxWidget.js