[akanevsky]

Just a small optimization:

Replace

PHP Code:

    if (!isset($legend))
    {
        $legend = $group['opentag'] . $group['title'] . $group['closetag'];
    }
    else
    {
        $legend .= " | " . $group['opentag'] . $group['title'] . $group['closetag'];
    } 


With

PHP Code:

    $legend .= " | " . $group['opentag'] . $group['title'] . $group['closetag']; 


This is safe to do because vBulletin unsets all the globals in init.php...

Other than that - nice job