sfHover = function() {
   var sfMMe = document.getElementById("mainmenu");
   if(sfMMe !== null){
     var sfEls = sfMMe.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);