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