function bulletin_com_update($story_id, $total_num)
{
    $mydirname = preg_replace('/[^0-9a-zA-Z_-]/', '', $GLOBALS['mydirname']);
    $article = new Bulletin($mydirname, $story_id);
    if (!$article->updateComments($total_num)) {
        return false;
    }
    return true;
}