function NotAvailable(sPage)
{
}

function imgOn(imgName)
{
  	document[imgName].src = "GUI/"+ imgName + "_over.gif";
}

function imgOff(imgName)
{
	document[imgName].src = "GUI/"+ imgName + ".gif"; 
}

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