function firstLast() {
	if (!document.getElementsByTagName) return false;
	if (!document.getElementById) return false;
	var lists = document.getElementsByTagName("ul");
	for (var i=0; i<lists.length; i++) {
		 var items = lists[i].getElementsByTagName("li");
		  first = items[0];
		  addClass(first,'first');
		  last = items[items.length-1];
		  addClass(last,'last');
	}	
}

addLoadEvent(firstLast);