sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
			this.style.zIndex=200;
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}

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

function cleart() {
	for(x = 1;x < 41; x++)	
		{
			var el = document.getElementById(x);
			el.className = "inv";
		} 
	x = 1;
	}  

function vist(loc)	{
	cleart();
	var el = document.getElementById(loc);
	el.className = "vis";
	}