sfHover = function() {
       var sfEls = document.getElementById("nav").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);