function addFocus() {
	var Els = document.getElementsByTagName("a");
	for (var i=0; i<Els.length; i++) {
		Els[i].onfocus=function() {
			this.className+=" focus";
		}
		Els[i].onblur=function() {
			this.className=this.className.replace(new RegExp(" focus\\b"), "");
		}
	}
}

if (window.attachEvent) window.attachEvent("onload", addFocus);