sfHover = function() {
   var sfEls = document.getElementById("navbeta").getElementsByTagName("LI");

   for (i in sfEls) {
   //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);