sfHover = function() 
	{
		
		var sfEls = document.getElementById("nav_menu").getElementsByTagName("li");
		
		for (var i=0; i<sfEls.length; i++) 
		{
			sfEls[i].onmouseover=function()
			{
				this.className+=" sfhover";
			}
			 
			sfEls[i].onmouseout=function() 
			{
				var t = this;
				
				setTimeout(function() { t.className=t.className.replace(new RegExp("\\s?sfhover\\b"), ""); }, 600); 
			}
		}
	}
	
	if (window.attachEvent) window.attachEvent("onload", sfHover)