function chiffres(event) {
	if(!event&&window.event)
	{
		event=window.event;
	}
	if(event.keyCode < 48 || event.keyCode > 57)
	{
		event.returnValue = false;
		event.cancelBubble = true;
	}
	if(event.which < 48 || event.which > 57)
	{
		event.preventDefault();
		event.stopPropagation();
	}
}