function montre(id) {
if (document.getElementById) {
document.getElementById(id).style.display="block";
} else if (document.all) {
document.all[id].style.display="block";
} else if (document.layers) {
document.layers[id].display="block";
}
}

function cache(id) {
if (document.getElementById) {
document.getElementById(id).style.display="none";
} else if (document.all) {
document.all[id].style.display="none";
} else if (document.layers) {
document.layers[id].display="none";
}
}

function changeImage(image, button)
{
document.images[button].src= image;
return true;
}

function changeImageBack(image, button)
{
 document.images[button].src = image;
 return true;
}