function ElementUtil(){};ElementUtil.addClass=function(elem,className){if(!elem.className){elem.className=className;}else{var names=elem.className.split(/\s+/);for(var i=0;i<names.length;i++){if(names[i]==className)return;}elem.className=elem.className+" "+className;}};ElementUtil.removeClass=function(elem,className){if(elem.className){var names=elem.className.split(/\s+/);var newClassName="";for(var i=0;i<names.length;i++){if(names[i]!=className){newClassName+=names[i]+" ";}}elem.className=newClassName;}};