math spam protector klappt nicht bei WP 2.6.5

<?php // Do not delete these lines
    if ('comments.php' == basename($_SERVER['SCRIPT_FILENAME']))
        die ('Please do not load this page directly. Thanks!');
        if (!empty($post->post_password)) 
        { // if there's a password
            if ($_COOKIE['wp-postpass_'.COOKIEHASH] != $post->post_password) 
            {        // and it doesn't match the cookie
?>
            <p class="nocomments">
                <?php _e("Dieser Beitrag ist gesch&uuml;tzt. Bitte Passwort eingeben um Kommentare zu anzuzeigen."); ?>
            </p>
<?php
                return;
            }
        }
        /* This variable is for alternating comment background */
        $oddcomment = 'alt';
?>


<!-- You can start editing here. -->
<hr />
<!-- Comments start here -->
<?php if (is_array($comments)) { ?>
    <?php if ( !empty($post->post_password) && $_COOKIE['wp-postpass_' . COOKIEHASH] != $post->post_password) { ?>
        <p>
            <?php _e('Gib Dein Passwort an um Kommentare anzuzeigen.'); ?>
        </p>
    <?php return; } ?>
    <h2 id="comments">
        <?php comments_number('Keine Kommentare', '1 Kommentar', '% Kommentare' );?>
        <?php _e('f&uuml;r'); ?> “ <?php the_title(); ?> ”
    </h2>
    
    <!-- Begin Comments -->
    <h3>
        <?php _e('Kommentare:') ?>
    </h3>
    <ol class="commentlist">
        <?php foreach ($comments as $comment) { ?>
        <?php if ($comment->comment_type != "trackback" && $comment->comment_type != "pingback" && !ereg("<pingback />", $comment->comment_content) && !ereg("<trackback />", $comment->comment_content)) { ?>
            <li class="<?php echo $oddcomment; ?>" id="comment-<?php comment_ID() ?>">
                <cite>
                    <?php comment_author_link() ?>
                </cite> <?php _e('meint:') ?>
                <?php if ($comment->comment_approved == '0') { ?>
                    <em><?php _e('Dein Kommentar liegt zur Moderation vor.') ?></em>
                <?php } ?>
                <br />
                <small class="commentmetadata">
                    <a href="#comment-<?php comment_ID() ?>" title="">
                        <?php comment_date('j. F Y') ?>
                        <?php _e(' um ') ?>
                        <?php comment_time() ?>
                    </a>
                    <?php edit_comment_link('','',''); ?>
                </small>
                <?php comment_text() ?>
            </li>
            <?php /* Changes every other comment to a different class */    
                if ('alt' == $oddcomment) $oddcomment = '';
                else $oddcomment = 'alt';
            ?>
        <?php } ?>
      <?php } /* end for each comment */ ?>
    </ol>
    <!-- End Comments -->
    <br />
<?php } else { // this is displayed if there are no comments so far ?>
    <?php if ('open' == $post-> comment_status) { ?>
        <!-- If comments are open, but there are no comments. -->
        <p class="nocomments"><?php _e('Noch keine Kommentare vorhanden. Sei der Erste!') ?></p>
    <?php } else { // comments are closed ?>
        <!-- If comments are closed. -->
        <p class="nocomments"><?php _e('Kommentare sind abgeschaltet.') ?></p>
    <?php } ?>
<?php } ?>


<?php if ('open' == $post-> comment_status) { ?>
    <h3 id="respond"><?php _e('Hinterlasse einen Kommentar') ?></h3>
    <?php if ( get_option('comment_registration') && !$user_ID ) { ?>
    <p><?php _e('Du musst ') ?><a href="<?php echo get_option('siteurl'); ?>/wp-login.php?redirect_to=<?php the_permalink(); ?>"><?php _e('angemeldet') ?></a> <?php _e(' sein, um einen Kommentar zu schreiben.') ?></p>
    <?php } else { ?>
        <form action="<?php echo get_option('siteurl'); ?>/wp-comments-post.php" method="post" id="commentform">
        <?php if ( $user_ID ) { ?>
            <p><?php _e('Angemeldet als ') ?><a href="<?php echo get_option('siteurl'); ?>/wp-admin/profile.php"><?php echo $user_identity; ?></a>. <a href="<?php echo get_option('siteurl'); ?>/wp-login.php?action=logout" title="<?php _e('Abmelden von diesem Account') ?>">Logout &raquo;</a></p>
        <?php } else { ?>
            <p>
                <input type="text" name="author" id="author" value="<?php echo $comment_author; ?>" size="22" tabindex="1" />
                <label for="author"><small><?php _e('Name');
                    if ($req) _e(' (erforderlich)'); ?>
                </small></label>
            </p>
            <p>
                <input type="text" name="email" id="email" value="<?php echo $comment_author_email; ?>" size="22" tabindex="2" />
                <label for="email"><small><?php _e('Mail (wird nicht publiziert');
                    if ($req) _e(', erforderlich)'); ?>
                </small></label>
            </p>
            <p>
                <input type="text" name="url" id="url" value="<?php echo $comment_author_url; ?>" size="22" tabindex="3" />
                <label for="url"><small><?php _e('Website'); ?></small></label>
            </p>


<?php 
/****** Math Comment Spam Protection Plugin ******/
if ( function_exists('math_comment_spam_protection') ) { 
    $mcsp_info = math_comment_spam_protection();
?>     <p><input type="text" name="mcspvalue" id="mcspvalue" value="" size="22" tabindex="4" />
    <label for="mcspvalue"><small>Spam protection: Sum of <?php echo $mcsp_info['operand1'] . ' + ' . $mcsp_info['operand2'] . ' ?' ?></small></label>
    <input type="hidden" name="mcspinfo" value="<?php echo $mcsp_info['result']; ?>" />
</p>
<?php } // if function_exists... ?>
        <?php } ?>
        <!--<p><small><?php _e('<strong>XHTML:</strong> Du kannst diese Tags verwenden: '); echo allowed_tags(); ?></small></p>//-->
            <p>
                <textarea name="comment" id="comment" cols="90%" rows="10" tabindex="4"></textarea>
            </p>
            <p>
                <input name="submit" type="submit" id="submit" tabindex="5" value="Kommentar senden" />
                <input type="hidden" name="comment_post_ID" value="<?php echo $id; ?>" />
            </p>
            <?php do_action('comment_form', $post->ID); ?>
        </form>
    <?php } // If registration required and not logged in ?>
<?php } // if you delete this the sky will fall on your head ?>
<br />
<?php if (is_array($comments)) { ?>
    <!-- Begin Trackbacks -->
    <?php foreach ($comments as $comment) { ?>
        <?php if (($comment->comment_type == "trackback") || ($comment->comment_type == "pingback") || ereg("<pingback />", $comment->comment_content) || ereg("<trackback />", $comment->comment_content)) { ?>
            <?php if (!$runonce) { $runonce = true; ?>
            <h3 id="trackbacks">
                <?php _e('Trackbacks &amp; Pingbacks:') ?>
            </h3>
            <ol class="commentlist">
            <?php } ?>
            <li class="<?php echo $oddcomment; ?>" id="comment-<?php comment_ID() ?>">
                <?php if (($comment->comment_type == "trackback") || ereg("<trackback />", $comment->comment_content))
                    _e('<strong>Trackback from </strong>'); 
                elseif (($comment->comment_type == "pingback") || ereg("<pingback />", $comment->comment_content))
                    _e('<strong>Pingback from </strong>'); 
                ?>
                <?php comment_author_link() ?>
                <?php if ($comment->comment_approved == '0') { ?>
                    <em><?php _e('Unser Kommentar liegt zur Moderation vor.') ?></em>
                <?php } ?>
                <br />
                <small class="commentmetadata">
                    <a href="#comment-<?php comment_ID() ?>" title="">
                        <?php comment_date('j. F Y') ?>
                        <?php _e('um') ?>
                        <?php comment_time() ?>
                    </a>
                <?php edit_comment_link('','',''); ?>
                </small>
                <?php comment_text() ?>
            </li>
        <?php } ?>
        <?php /* Changes every other comment to a different class */    
            if ('alt' == $oddcomment) $oddcomment = '';
            else $oddcomment = 'alt';
        ?>
    <?php } ?>
    <?php if ($runonce) { ?>
        </ol>
    <?php } ?>
    <!-- End Trackbacks -->
<?php } ?>