PX_cssutils={}
PX_cssutils.addClass=function(obj,cls){obj=obj||this;cls=cls||"";obj.className+=(" "+cls);};
PX_cssutils.delClass=function(obj,cls){obj=obj||this;cls=cls||"";obj.className=obj.className||"";obj.className=obj.className.replace(new RegExp("\\s*"+cls+"\\b"), "");};
PX_cssutils.toggleClass=function(obj,cls){
	if (typeof(obj)=="string"){obj=document.getElementById(obj)};
	if (obj.className.search(new RegExp("\\b"+cls))!=-1){PX_cssutils.delClass(obj,cls)	} else {	PX_cssutils.addClass(obj,cls)	}
}