function imgOn(imgName) 
	{
  	    if(document[imgName])
  	    {
  	        document[imgName].src = "GUI/"+ imgName + "_over.jpg";
  	    }
    }
	function imgOff(imgName) 
    {
	    if(document[imgName])
	    {
  	        document[imgName].src = "GUI/"+ imgName + ".jpg"; 
  	    }
    }
	
	  
sfHover = function() {
if(document.getElementById("navbar")){
	var sfEls = document.getElementById("navbar").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);