if (document.images)
{ 
img1on = new Image ;    
img1off = new Image ;
 
img2on = new Image ;    
img2off = new Image; 

img3on = new Image ;    
img3off = new Image; 

img4on = new Image ;    
img4off = new Image; 

img1on.src = "Picture/boll_menu2_1.jpg";    
img1off.src = "Picture/boll_menu2.jpg";

img2on.src = "Picture/boll_menu2_1.jpg";    
img2off.src = "Picture/boll_menu2.jpg";

img3on.src = "Picture/boll_menu2_1.jpg";    
img3off.src = "Picture/boll_menu2.jpg";

img4on.src = "Picture/boll_menu2_1.jpg";    
img4off.src = "Picture/boll_menu2.jpg";
}

function img_act(imgName) {
if (document.images)
{ imgOn = eval (imgName + "on.src");
document [imgName].src = imgOn; } }

function img_inact(imgName) {
if (document.images)
{ imgOff = eval(imgName + "off.src");
document [imgName].src = imgOff; } }