$model_id = trim($_GET['last']);
$columns = $this->db->get_columns('item');
$selectbox = $this->db->columns_get_selectbox($columns, 'item');
$model_id = trim($_GET['last']);
$columns = $this->db->get_columns('item');
$selectbox = $this->db->columns_get_selectbox($columns, 'item');