if (!this.hasStyleClass(className)) 
if (className && !this.hasStyleClass(className)) 
Element.prototype.addStyleClass = function(className) {    if (!this.hasStyleClass(className))        this.className += (this.className.length ? " " + className : className);}
1725	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1725/046bdcb6878a60db3e3cddff23f5e46d170666a3/utilities.js/clean/WebCore/page/inspector/utilities.js