function highlight() {
	var items = getElementsByClass("off");
	for (var i=0; i<items.length; i++) {
		items[i].oldClassName = items[i].className;
		items[i].onmouseover = function() {
			addClass(this,"on");
			return false;
		}
		items[i].onmouseout = function() {
			this.className = this.oldClassName;
		}
}
}

addLoadEvent(highlight);