<code lang="JavaScript">
var classCtl={
	split:function (obj) { return obj.className.split(/ /); },
	has:function (obj,str) { return classCtl.mkRE(str,true).test(obj.className); },
	add:function (obj,str) { return (obj.className+=(obj.className==''?'':' ')+str); },
	del:function(obj,str) { return (obj.className=
		obj.className.replace(classCtl.mkRE(str,false),' ').replace(/(^\s+|\s+$)/,'')); 
	},
	mkRE: function (str,type) {
		return new RegExp(
			'(^| )'+str.replace(/([\\\\\.\?\(\)\{\}\"\'\+\*\^\$])/g,'\\$1')+'( |$)',
			type?'i':'ig'
		);
	}
}
</code>