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