var navVersion = navigator.appVersion.substring(0,1);
if (navVersion >= 3)
{

im0 = new Image;
im0 = "images/home/bouton_off.gif";
im1 = new Image;
im1 = "images/home/bouton_on.gif";
im2 = new Image;
im2 = "images/home/bouton_on.gif";
im3 = new Image;
im3 = "images/home/bouton_on.gif";
im4 = new Image;
im4 = "images/home/bouton_on.gif";

}