function sfHover() 
{
	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"), "");
		}
	}
}