x = "images/nav_"
if (document.images) {            
 			
			whoon = new Image();  whoon.src = x + "who_mo.gif";
			issueson = new Image();  issueson.src = x + "issues_mo.gif";
			newson = new Image();  newson.src = x + "news_mo.gif";
			resourceson = new Image();  resourceson.src = x + "resources_mo.gif";
			eventson = new Image();  eventson.src = x + "events_mo.gif";
 			
			whooff = new Image();  whooff.src = x + "who_on.gif";
			issuesoff = new Image();  issuesoff.src = x + "issues_on.gif";
			newsoff = new Image();  newsoff.src = x + "news_on.gif";
			resourcesoff = new Image();  resourcesoff.src = x + "resources_on.gif";
			eventsoff = new Image();  eventsoff.src = x + "events_on.gif";
						
        }
    function imgOn(imgName) {
            if (document.images) {
                document[imgName].src = eval(imgName + "on.src");       
            }
    }
    function imgOff(imgName) {
            if (document.images) {
                document[imgName].src = eval(imgName + "off.src");        
            }
           
    }