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);