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);