if (document.images) {            // Active Images
            img1on = new Image();      
            img1on.src = "images/b1on.gif"; 
            img2on = new Image(); 
            img2on.src = "images/b2on.gif";  
            img3on = new Image();
            img3on.src = "images/b3on.gif";
            img4on = new Image();
            img4on.src = "images/b4on.gif";
            img5on = new Image();
            img5on.src = "images/b5on.gif";
            img6on = new Image();
            img6on.src = "images/b6on.gif";
            img7on = new Image();
            img7on.src = "images/b7on.gif";
         
            img1off = new Image(); 
            img1off.src = "images/b1.gif"; 
            img2off = new Image();          
            img2off.src = "images/b2.gif"; 
            img3off = new Image();
            img3off.src = "images/b3.gif";
            img4off = new Image();
            img4off.src = "images/b4.gif";
            img5off = new Image();
            img5off.src = "images/b5.gif";
            img6off = new Image();
            img6off.src = "images/b6.gif";
            img7off = new Image();
            img7off.src = "images/b7.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");
				}
		}