function refreshCaptcha(id) {
	new Ajax.Request('classes/formulaire/captcha/refresh.php',
		{
		asynchronous:true,
		method: 'get',
		onSuccess: function(t) {
			eval(t.responseText);
			$('imgCaptcha').innerHTML = img;
			$('vCaptcha').innerHTML = valueCaptcha;
		}
	});
}