Frage bezgl. Upgrade von Wordpress MU

<?php
function cjd_get_spam_count() {
	global $wpdb;
	
	if (isset($_POST['action']) && ('nuked' == $_POST['action'])):
		return 0;
	else:
		return $wpdb->get_var("SELECT COUNT(comment_ID) FROM $wpdb->comments WHERE comment_approved = 'spam'");
	endif;
}


function cjd_delete_add_manage_page() {
	$spam_count = "Spam (" . cjd_get_spam_count() . ")";
	
	add_submenu_page("edit-comments.php", $spam_count, $spam_count, 2, "spam", "cjd_admin_page");
}


function cjd_admin_page() {
	global $wpdb, $comment;
if ( (isset($_POST['submit'])) && ('deleted' == $_POST['action']) ) {
	$i = 0;
	foreach ($_POST['not_spam'] as $comment) : 
		$comment = (int) $comment;
		$wpdb->query("UPDATE $wpdb->comments SET comment_approved = '1' WHERE comment_ID = '$comment' AND comment_approved = 'spam'");
			++$i;
	endforeach;
	echo '<div class="updated"><p>' . sprintf(__('Na bitte, geht doch: %s mal entspammt!'), $i) . "</p></div>";
}
if ('nuked' == $_POST['action']) {
	$nuked = $wpdb->query("DELETE FROM $wpdb->comments WHERE comment_approved = 'spam'");
	if (isset($nuked)){
		echo '<div class="updated"><p>';
		if ($nuked) {
			echo __("alles platt gemacht, Rowwwr!");
		}
		echo "</p></div>";
	}
}
?>
<div class="wrap">
<h2>Und so geht's:</h2>
<p>Entweder Du benutzt den <strong>Massenspam Killer</strong> und macht alle Eintr&auml;ge auf einmal platt,<br />
oder du nimmst den <strong>Entspammer</strong> und w&auml;hlst die Spamkommentare einzeln aus.</p> 
</div>


<div class="wrap">
<h2>Massenspam Killer</h2>
<?php
$spam_count = cjd_get_spam_count();
if (0 == $spam_count)
{
	_e('<p align="center"><strong>Gl&uuml;ckwunsch</strong> -- Ein spamfreies Blog!</p>');
	echo '</div>';
} else {
	_e('<p>Der Massenspam Killer kann alle Eintr&auml;ge in der Datenbank r&uuml;ckstandsfrei l&ouml;schen, die mit Spam gebrandmarkt wurden. <br />Feine Sache, aber Achtung, die Aktion ist hinterher nicht mehr r&uuml;ckg&auml;ngig zu machen!</p>');
?>
<form method="post" action="edit-comments.php?page=spam&amp;action=nuked" name="form1">
<input type="hidden" name="action" value="nuked" /> 
In der Datenbank lungern gerade &nbsp; <strong><?php echo $spam_count; ?></strong> &nbsp; Kommentare, die als Spam markiert sind. 
<p><input type="submit" name="Submit" value="Bitte sofort alle gnadenlos plattmachen!" /> </p>
</form>
</div>


<div class="wrap">
<h2>Entspammer</h2>
		<?php _e('<p>Mit diesem unglaublichen Entspammer kann ein geliebter Beitrag von l&auml;stigen Parasiten befreit werden. 
		<br />Dazu einfach einen Haken an alle fiesen Kommentare machen, die entfernt werden sollen.
		<br />Anschlie&szlig;end braucht man nur noch auf die g&ouml;ttliche Taste klicken.</p>')?>
<?php
		$comments = $wpdb->get_results("SELECT *, COUNT(*) AS count FROM $wpdb->comments WHERE comment_approved = 'spam' GROUP BY comment_author_IP");
		if ($comments) {
?>
<form method="post" action="edit-comments.php?page=spam" name="form2">
<input type="hidden" name="action" value="deleted" />


<table width="100%" cellpadding="3" cellspacing="3"> 
  <tr>
	<th scope="col"><?php _e('Spam?') ?></th>
    <th scope="col"><?php _e('Name') ?></th> 
    <th scope="col"><?php _e('eMail') ?></th> 
    <th scope="col"><?php _e('Adresse') ?></th>
	<? if ( is_site_admin() ) { ?><th scope="col"><?php _e('IP') ?></th><? } ?>
	<th scope="col"><?php _e('Kommentare') ?></th> 
  </tr>
<?php
    foreach($comments as $comment) {
			$comment_date = mysql2date(get_settings("date_format") . " @ " . get_settings("time_format"), $comment->comment_date);
			$post_title = $wpdb->get_var("SELECT post_title FROM $wpdb->posts WHERE ID='$comment->comment_post_ID'");
?>
<?php
$bgcolor = '';
$class = ('alternate' == $class) ? '' : 'alternate';
?> 
<tr class='<?php echo $class; ?>'> 
   	<td align="center"><input type="checkbox" name="not_spam[]" value="<?php comment_ID(); ?>" /></td>	
	<td><?php comment_author() ?></td>
    <td align="center">
    <?php comment_author_email_link() ?> 
    </td> 
    <td align="center"><?php comment_author_url_link() ?></td>
    <? if ( is_site_admin() ) { ?><td align="center"><a href="http://ws.arin.net/cgi-bin/whois.pl?queryinput=<?php comment_author_IP() ?>"><?php comment_author_IP() ?></a></td><? } ?>
    <td align="center"><?php echo $comment->count ?></td> 
  </tr>
	<?php
		}
	}
	?>
	</table>
	<br />
	<input type="submit" name="submit" value="Herr, entspamme mich!" />
	</form> 
	</div>
<?php
}
}
add_action('admin_menu', 'cjd_delete_add_manage_page');
?>