function($group_id = NULL)
{
return $this->db->getColArray(
"
SELECT ".$this->class_cfg['arch']['users']['id']."
FROM ".$this->class_cfg['tables']['users']."
WHERE {$this->db->escape($this->class_cfg['tables']['users'].'.'.$this->class_cfg['arch']['users']['active'])} = 1
AND ".$this->class_cfg['arch']['users']['id_group']." ".( $group_id ? "= ".(int)$group_id : "!= 1" )
);
}
