if (document.images) {

img1off = new Image(); 
img1off.src = "../menu/1.gif";
img1on = new Image(); 
img1on.src = "../menu/1b.gif"; 

img2off = new Image(); 
img2off.src = "../menu/2.gif";
img2on = new Image(); 
img2on.src = "../menu/2b.gif"; 

img3off = new Image(); 
img3off.src = "../menu/3.gif";
img3on = new Image(); 
img3on.src = "../menu/3b.gif"; 

img4off = new Image(); 
img4off.src = "../menu/4.gif";
img4on = new Image(); 
img4on.src = "../menu/4b.gif"; 

img5off = new Image(); 
img5off.src = "../menu/5.gif";
img5on = new Image(); 
img5on.src = "../menu/5b.gif"; 

}
function changeImages() {
if (document.images) {
for (var i=0; i<changeImages.arguments.length; i+=2) {
document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
}
}
}