function modifyQty()
{
$cart_id = get_post_value('cart_id');
$qty = get_post_value('qty');
// echo $cart_id;
// echo $qty;
$cart = new Carts();
$modifyQty = $cart->modifyQty($cart_id, $qty);
if ($modifyQty) {
$this->assign('message', $modifyQty);
$this->setReturnType('message');
}
}
