Problem mit tagging in wp2.3

<?php
get_header();
?>


<div id="content">
  <?php if (have_posts()) : ?>
  <?php $post = $posts[0]; // Hack. Set $post so that the_date() works. ?>
  <?php 
    if (is_category()) { ?>
  <h2 class='archives'>Archiv f&uuml;r Kategorie:  '<?php echo single_cat_title(); ?>'</h2>
<br/>
  <?php }
     


elseif (is_day()) { ?>
  <h2 class='archives'>Archiv f&uuml;r
    <?php the_time('j. F  Y '); ?>
  </h2>
  <?php }
    
    elseif (is_month()) { ?>
  <h2 class='archives'>Archiv f&uuml;r
    <?php the_time('F, Y'); ?>
  </h2>
  <?php } 


elseif (is_tag()) { ?>
  <h2 class='archives'>Tag-Archiv f&uuml;r
    '<?php echo single_tag_title(); ?>'
  </h2>
  <?php }
     
    elseif (is_year()) { ?>
  <h2 class='archives'>Archiv f&uuml;r
    <?php the_time('Y'); ?>
  </h2>
  <?php } 
    
    elseif (is_author()) { ?>
  <h2 class='archives'>Autor Archiv</h2>
  <?php }
     
    elseif (isset($_GET['paged']) && !empty($_GET['paged'])) { ?>
    <h2>Blog Archiv</h2>
    <?php } ?>
  <?php while (have_posts()) : the_post(); ?>
  <div class="entry">
    <h3 class="entrytitle" id="post-<?php the_ID(); ?>"> <a href="<?php the_permalink() ?>" rel="bookmark">
      <?php the_title(); ?>
      </a> </h3>
    <div class="entrymeta">
      Geschrieben am <?php 
            the_time('j. F  Y ');
            $comments_img_link= '<img src="' . get_stylesheet_directory_uri() . '/images/comments.gif"  title="comments" alt="*" /><strong>';
            comments_popup_link($comments_img_link .' Kommentare(0)', $comments_img_link .' Kommentare(1)', $comments_img_link . ' Kommentare(%)'); 
            edit_post_link(__(' Bearbeiten'));?></strong>
       </div>
    <div class="entrybody">
      <?php the_content(__('Weiterlesen &raquo;'));?>
    </div>
    <!--
    <?php trackback_rdf(); ?>
    -->
  </div>
  <?php endwhile; else: ?>
  <p>
    <?php _e('Keine Beitr&auml;ge zu deinem Suchbegriff gefunden.'); ?>
  </p>
  <?php endif; ?>
<hr/>
  <?php if(function_exists('wp_pagenavi')) { wp_pagenavi(); } ?>


</div>
<?php get_sidebar(); ?>
<?php get_footer(); ?>