$quantity_removed = $_GET['quantity'];
if($quantity_removed <= 0) $this->post_redirect_get("$URL_INTERNAL/1","Can't dispose non-possitive amount of items!");
if(!is_numeric($quantity_removed)) $quantity_removed = 1;
$quantity_stored = $this->db->map_unique('item_serial', $item_serial, 'item_quantity', 'item', false);
if(!is_numeric($quantity_stored)) $quantity_stored = 0;
$item_quantity = $quantity_stored - $quantity_removed;
$quantity_removed = $_GET['quantity'];
if($quantity_removed <= 0) $this->post_redirect_get("$URL_INTERNAL/1","Can't dispose non-possitive amount of items!");
if(!is_numeric($quantity_removed)) $quantity_removed = 1;
$quantity_stored = $this->db->map_unique('item_serial', $item_serial, 'item_quantity', 'item', false);
if(!is_numeric($quantity_stored)) $quantity_stored = 0;
$item_quantity = $quantity_stored - $quantity_removed;