function getRoomFilter($table = FALSE)
{
    require_once $GLOBALS["where_scs"] . "/lib/lib.chat.php";
    $chatman = new ChatManager();
    $res = "";
    $tab_prefix = $table === FALSE ? "" : $table . ".";
    $room_list = $chatman->getRoomFilter();
    $room_type = $chatman->getRoomTypeFilter();
    if (!empty($room_list)) {
        $res .= " AND " . $tab_prefix . "id_room IN (" . $room_list . ")";
    }
    if (!empty($room_type)) {
        $res .= " AND " . $tab_prefix . "room_type IN (" . $room_type . ")";
    }
    return $res;
}