[inebriate]

i would recommend against the code i gave you before, since i believe the alert will still come up when there is an error with adding the product

instead in include/cart_process.php (or cart.php for 4.0.x), after

	if ($productid && $amount) {

		if ($amount < $added_product["min_amount"]) {
			$return["redirect_to"] =  "error_message.php?access_denied&id=31";
			return $return;
		}

put
echo "<script>alert('Product has been added.')</script>";