function AddClass(obj,cName){KillClass(obj,cName);return obj&&(obj.className+=(obj.className.length>0?' ':'')+cName);}
function KillClass(obj,cName){return obj&&(obj.className=obj.className.replace(new RegExp("^"+cName+"\\b\\s*|\\s*\\b"+cName+"\\b",'g'),''));}
function HasClass(obj,cName){return(!obj||!obj.className)?false:(new RegExp("\\b"+cName+"\\b")).test(obj.className)}