sfHover = function() {
        if (document.getElementById("nav")) {
          if (document.getElementById("nav").getElementsByTagName("LI")) {
            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);