New xsell action

      case 'buy_now_xsell' :  if (isset($_GET['products_id'])) {
                                if (tep_has_product_attributes($_GET['products_id'])) {
                                  tep_redirect(tep_href_link('product_info.php', 'products_id=' . $_GET['products_id']));
                                } else {
                                  $cart->add_cart($_GET['products_id'], $cart->get_quantity($_GET['products_id'])+1);
                                  $messageStack->add_session('product_action', sprintf(PRODUCT_ADDED, tep_get_products_name((int)$_GET['products_id'])), 'success');
                                }
                              }
                              tep_redirect(tep_href_link($goto, tep_get_all_get_params($parameters)));
                              break;