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.onfocus=function() {
                        this.className+=" over";
                    }
                    node.onmouseout=function() {
                        this.className=this.className.replace(" over", "");
                    }
                    node.onblur=function() {
                        this.className=this.className.replace(" over", "");
                    }
                 }
             }
          }
}

window.onload=startList;