function ventana(id) {
	window.open('', id,'toolbar=no,location=no,directories=no,status=yes,menubar=no,scrollbars=yes,resizable=yes,width=620,height=500');
}

var sfHover = function() {
	if(document.getElementById("nav")){
		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);