startList = function() {
	navRoot = document.getElementById("mainNav");
	for (i=0; i<navRoot.childNodes.length; i++) {
		node = navRoot.childNodes[i];
		if (node.nodeName=="LI") {
			node.onmouseover=function() {
				this.className+=" over";
			}
			node.onmouseout=function() {
				this.className=this.className.replace(" over", "");
			}
		}
	}
}

Behaviour.addLoadEvent (
	function() {
		if (document.all&&document.getElementById) {
			startList();
		}
	}
);