comment plugger not showing

I used comment plugger in a my-hacks document. It worked fine in WordPress v2.1 but it doesn’t show up on v2.3. If anyone can help me figure out what’s wrong, that’d be great.

Here’s the code:

<?php

function comment_plugger($before = '<b>Thanks for your comment:</b> ', $limit = 10, $sep = ', ') {
        global $wpdb, $tablecomments, $id;
        $request  = "SELECT comment_author, comment_author_url, MAX(comment_ID) as comment_ID FROM $tablecomments";
        $request .= " WHERE comment_post_ID='$id' AND comment_approved = '1' GROUP BY comment_author, comment_author_url ORDER BY comment_ID DESC";
        $request .= ($limit > 0) ? " LIMIT $limit" : '';
        $commenters = $wpdb->get_results($request);

        if ($commenters) {
                $output = '';
                foreach ($commenters as $commenter) {
                        if (!empty($commenter->comment_author_url)) {
                                $output[] = '<a href="' . $commenter->comment_author_url . '" title="' . $commenter->comment_author . '">' . $commenter->comment_author . '</a>';
                        }
                        else {
                                $output[] = $commenter->comment_author;
                        }
                }

                if (is_array($output)) {
                        echo $before.implode($sep, $output);
                }
        } else {
//      echo "No one...yet.";
        }
}

?>

Here’s my website: http://suefeng.com