if (document.images) {
	imgLon = new Image();           // Active images
	imgLon.src =  "/graphics/1LogoCircle.gif";  
	imgLoff = new Image();          // Inactive images
	imgLoff.src = "/graphics/0LogoCircle.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");        
            }
    }