function buildMenu() {
    if (document.all && document.getElementById) {
        menu = document.getElementById('nav-ul');
        navItems = menu.getElementsByTagName("li");

        for (i = 0; i < navItems.length; i++) {
            node = navItems[i];
            node.onmouseover = function() { this.className += " menu"; }
            node.onmouseout = function() { this.className = this.className.replace(" menu", ""); }
        }
    }
}