sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
			hide_filter()
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
			 show_filter()
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

function show_filter(){
var filter = document.getElementById('filter-in');

if(filter == null) return;
filter.style.display="block";
}

function hide_filter(){
var filter = document.getElementById('filter-in');

if(filter == null) return;
filter.style.display="none";

}