<!--[if lt IE 7]>
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'),'');
		}
	}
}
window.onload = sfHover;
<![endif]-->