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);