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", ""); }

//                node.onmouseover = function() { this.setAttribute("class", this.className + " over"); }
//                node.onmouseout = function() { this.setAttribute("class", this.className.replace(" over", "")); }
            }
        }
    //}
}

window.onload=startList;