pvuong comments.php for Spam Free Wordpress

<?php
if (!empty($_SERVER['SCRIPT_FILENAME']) && 'comments.php' == basename($_SERVER['SCRIPT_FILENAME']))
    die (_e('Please do not load this page directly. Thanks!'));

if ( post_password_required() ) { ?>
    <p class="nocomments"><?php _e('This post is password protected. Enter the password to view comments.')?></p>
<?php
    return;
}
?>

<?php if ( have_comments() ) : ?>
    <h3 class="commentheading"><?php comments_number('Be the first to comment on', '1 Response to', '% Responses to' );?> "<?php the_title(); ?>"</h3>

    <ul id="comments" class="commentlist">
        <?php wp_list_comments('callback=tbf1_comment'); ?>
    </ul>

    <div class="navigation">
        <div class="alignleft"><?php previous_comments_link(__('Older Comments')) ?></div>
        <div class="alignright"><?php next_comments_link(__('Newer Comments')) ?></div>
        <div class="recover"></div>
    </div>
 <?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. -->

     <?php else : // comments are closed ?>
        <!-- If comments are closed. -->
        <?php echo (!is_page()) ? '<p class="nocomments">Comments are closed.</p>' : '' ?>

    <?php endif; ?>
<?php endif; ?>


<?php if ('open' == $post->comment_status) : ?>
<div id="respond">

<?php comment_form(); ?>

</div>
<?php endif; ?>