function chiffres(event) {
	// Compatibilité IE / Firefox
	if(!event&&window.event) {
		event=window.event;
	}
	// IE
	if((event.keyCode < 48 || event.keyCode > 57) && (event.keyCode != 8) && (event.keyCode != 9) && (event.keyCode != 11)) {
		event.returnValue = false;
		event.cancelBubble = true;
	}
	// DOM
	if((event.which < 48 || event.which > 57) && (event.which != 8) && (event.which != 9) && (event.keyCode != 11)) {
		event.preventDefault();
		event.stopPropagation();
	}
}