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", "");}
            }
        }
    }
}
window.onload=startList;