sfHover = function() { 
    if(document && document.getElementById && document.getElementById('nav2') ){
    var sfEls = document.getElementById("nav2").getElementsByTagName("LI");
     for (var i=0; i<sfEls.length; i++) {
        sfEls[i].onmouseover=function() {
            this.className+=" sfhover";
        }
        sfEls[i].onmouseout=function() {
            this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
        }
      } 
      }
 } 
 if (window.attachEvent) window.attachEvent("onload", sfHover);