function nick($user_id){
        global $db;
        if(!$us = $db->query('SELECT `id`, `time`, `level`, `nick`, `gender` FROM `users` WHERE `id` = "'. $user_id .'"'))
            return 'User not exists';
        $us = $us->fetch();
        if($us['time'] > (time()-300)) {
            $on = img('on.png');
        } else {
            $on = img('off.png');
        }
        return img($us['gender'].'.png') .' <a href="/user/'. $us['id'] .'/">'.($us['level'] >=6 ? '<span class="red">'.$us['nick'].'</span>' : ($us['level'] >= 2 && $us['level'] <= 5 ? '<span style="color:#22b14c;">'.$us['nick'].'</span>' : $us['nick'])) .'</a> '. $on;
    }