if (document.images) {            // nav main
            homeon = new Image();      
            homeon.src = "images/nav/nav_home_on.gif"; 
            caseson = new Image();      
            caseson.src = "images/nav/nav_cases_on.gif"; 
            issueson = new Image(); 
            issueson.src = "images/nav/nav_issues_on.gif"; 
            newson = new Image();
            newson.src = "images/nav/nav_news_on.gif";
            pubson = new Image();
            pubson.src = "images/nav/nav_pubs_on.gif";
            scholarson = new Image();
            scholarson.src = "images/nav/nav_scholars_on.gif";
            abouton = new Image();
            abouton.src = "images/nav/nav_about_on.gif";
            archiveson = new Image();
            archiveson.src = "images/nav/nav_archives_on.gif";
            supporton = new Image();
            supporton.src = "images/nav/nav_support_on.gif";
            searchon = new Image();
            searchon.src = "images/nav/nav_search_on.gif";

            homeoff = new Image(); 
            homeoff.src = "images/nav/nav_home.gif"; 
            casesoff = new Image(); 
            casesoff.src = "images/nav/nav_cases.gif"; 
            issuesoff = new Image();          
            issuesoff.src = "images/nav/nav_issues.gif"; 
            newsoff = new Image();
            newsoff.src = "images/nav/nav_news.gif";
            pubsoff = new Image();
            pubsoff.src = "images/nav/nav_pubs.gif";
            scholarsoff = new Image();
            scholarsoff.src = "images/nav/nav_scholars.gif";
            aboutoff = new Image();
            aboutoff.src = "images/nav/nav_about.gif";
            archivesoff = new Image();
            archivesoff.src = "images/nav/nav_archives.gif";
            supportoff = new Image();
            supportoff.src = "images/nav/nav_support.gif";
            searchoff = new Image();
            searchoff.src = "images/nav/nav_search.gif";

        }

			// Function to 'activate' images.
			function imgOn(imgName) {
				if (document.images) {
				    document[imgName].src = eval(imgName + "on.src");
				 }
			}

			// Function to 'deactivate' images.
			function imgOff(imgName) {
				  if (document.images) {
				     document[imgName].src = eval(imgName + "off.src");
					}

				}


		//popup script for window without the scroll bar
		function callMe(myUrl,w,h) {
	        self.name = "main"; 
    	    newWin=eval('window.open(\''+myUrl+'\',"firstwindow","toolbar=no,scrollbars=no,top=120,left=80,width='+w+',height='+h+',menubar=no,statusbar=no,location=no");');
			newWin.focus();
		}