if (document.images) {       
img1on = new Image();		
img1on.src = "./images/on1.gif"; 
img2on = new Image();
img2on.src = "./images/on2.gif";  
img3on = new Image();
img3on.src = "./images/on3.gif";
img4on = new Image();
img4on.src = "./images/on4.gif";
img5on = new Image();
img5on.src = "./images/on5.gif";
img6on = new Image();
img6on.src = "./images/on6.gif";
img7on = new Image();
img7on.src = "./images/on7.gif";
img8on = new Image();
img8on.src = "./images/on8.gif";
img9on = new Image();
img9on.src = "./images/on9.gif";
img10on = new Image();
img10on.src = "./images/on10.gif";
img11on = new Image();
img11on.src = "./images/on11.gif";
img12on = new Image();
img12on.src = "./images/on12.gif";
img13on = new Image();
img13on.src = "./images/on13.gif";
img14on = new Image();
img14on.src = "./images/on14.gif";
img15on = new Image();
img15on.src = "./images/on15.gif";

img1off = new Image();		  	
img1off.src = "./images/off1.gif"; 
img2off = new Image();          
img2off.src = "./images/off2.gif";
img3off = new Image();
img3off.src = "./images/off3.gif";
img4off = new Image();
img4off.src = "./images/off4.gif";
img5off = new Image();
img5off.src = "./images/off5.gif";
img6off = new Image();
img6off.src = "./images/off6.gif";
img7off = new Image();
img7off.src = "./images/off7.gif";
img8off = new Image();
img8off.src = "./images/off8.gif";
img9off = new Image();
img9off.src = "./images/off9.gif";
img10off = new Image();
img10off.src = "./images/off10.gif";
img11off = new Image();
img11off.src = "./images/off11.gif";
img12off = new Image();
img12off.src = "./images/off12.gif";
img13off = new Image();
img13off.src = "./images/off13.gif";
img14off = new Image();
img14off.src = "./images/off14.gif";
img15off = new Image();
img15off.src = "./images/off15.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");        }}