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"), ""); }
	}
}
if(window.attachEvent) {
	window.attachEvent("onload", sfHover);
} else if(window.addEventListener) {
	window.addEventListener("onload", sfHover, false);
}