sfHover = function() {
var sfEls = document.getElementById("nav").getElementsByTagName("LI");
var sfEls2 = document.getElementById("nav2").getElementsByTagName("LI");
var sfEls3 = document.getElementById("nav3").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"), "");
	}
}

for (var i=0; i<sfEls2.length; i++) {
	sfEls2[i].onmouseover=function() {
		this.className+=" sfhover";
	}
	sfEls2[i].onmouseout=function() {
		this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
	}
}

for (var i=0; i<sfEls3.length; i++) {
	sfEls3[i].onmouseover=function() {
		this.className+=" sfhover";
	}
	sfEls3[i].onmouseout=function() {
		this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
	}
}

}
if (window.attachEvent) window.attachEvent("onload", sfHover);