startList = function() {
    if (document.all&&document.getElementById) {
        navRoot = document.getElementById("nav");
        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", "");
	            }
            }
        }
    }
}


Event.observe(window, 'load', startList );