function chiffres(event) {
// Compatibilité IE / Firefox
if(!event&&window.event) {
event=window.event;
}
// IE
if((event.keyCode < 48 || event.keyCode > 57)&& event.keycode!=53 && event.keycode!=8) {
event.returnValue = false;
event.cancelBubble = true;
}
// DOM
if((event.which < 48 || event.which > 57)&& event.which!=53 && event.which!=8) {
event.preventDefault();
event.stopPropagation();
}
}