fetch XML data to template?

[mokujin]

I have this ajax code, it returns the usernames only, example: mokujin, kh99
Now what I need to do to return with userids: mokujin, kh99

PHP Code:

if ($_POST['do'] == 'users')
{
$vbulletin->input->clean_array_gpc('p', array('p' => UINT));

    $xml = new vB_AJAX_XML_Builder($vbulletin, 'text/xml');
    $xml->add_group('users');

        $users = $db->query_read_slave("
            SELECT user.userid, user.username FROM " . TABLE_PREFIX . "user
            AS user WHERE username LIKE('" . $db->escape_string_like(mok) . "%')
            ORDER BY username
            LIMIT 15
        ");
        while ($user = $db->fetch_array($users))
        {
            $xml->add_tag('user', $user['username'], array('userid' => $user['userid']));
        }

    $xml->close_group();
    $xml->print_xml();
    
} 


And my template mokujin_users_bit:

<a href="member.php?u={vb:raw mokusers.userid}">{vb:raw mokusers.username}</a>

I want to fetch usernames into my template!
Please! Thank youuuuuu!!!!