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