function updPromo()
{
$promo = params("promo");
$newLabel = params("newLabel");
$promoToUpd = Promo::getPromoByPromo($promo);
$promoToUpd->setLabel($newLabel);
$status = $promoToUpd->update();
set("status", $status);
header('Content-Type: application/json');
return render("status.json.php");
}