Kategorie auf index.php ausschließen - PROBLEM

<?php get_header();?>
  <div id="content">  
   <!-- primary content start -->
<?php 
if (is_home() ) query_posts($query_string.'&cat=-3');
while (have_posts()) : the_post(); ?>
 
 
 
        <?php endwhile; ?>
   <?php if ($posts) {
    if (get_settings('terrafirma_asideid') != "")
     $AsideId = get_settings('terrafirma_asideid');
    function stupid_hack($str)
    {
     return preg_replace('|</ul>\s*<ul class="asides">|', '', $str);
    }
    ob_start('stupid_hack');
    foreach($posts as $post)
    {
     the_post();
    ?>
    <?php if ( in_category($AsideId) ) : ?>
     <ul class="asides">
      <li id="p<?php the_ID(); ?>">
       <?php echo wptexturize($post->post_content); ?>       
       <br/>
       <?php comments_popup_link('(0)', '(1)','(%)')?>  | <a href="<?php the_permalink(); ?>" title="Permalink: <?php echo wptexturize(strip_tags(stripslashes($post->post_title), '')); ?>" rel="bookmark">#</a> <?php edit_post_link('(Bearbeiten)'); ?>
      </li>      
     </ul>
     <?php else: // If it's a regular post or a permalink page ?>
      <div class="post" id="post-<?php the_ID(); ?>">
       <div class="header">
        <h3><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a></h3>
<small>
    <?php _e('Verfasst am');?> <?php the_time(__('d.m.Y')); ?> <?php _e('von');?> <?php the_author_posts_link('namefl'); ?>
 
    </small>    
       </div>
       <div class="entry">
        <?php the_content('Den ganzen Beitrag lesen &raquo;'); ?>
        <?php wp_link_pages(); ?>
                <p class="post-tags">
                  <?php if (function_exists('the_tags')) the_tags('Tags: ', ', ', '<br/>'); ?>
                </p>
       </div>
       <div class="footer">
        <ul>
 
        </ul>
       </div>    
      </div> 
     <?php endif; // end if in category ?>
    <?php
    }
   }
   else
   {
    echo '<p>Beitrag / Seite nicht gefunden.</p>';
   }
  ?>
  <p align="center"><?php posts_nav_link(' - ','« Vorherige Eintr&auml;ge','N&auml;chste Eintr&auml;ge »') ?></p>  
  <!-- primary content end --> 
  </div>  
 <?php get_sidebar();?> 
<?php get_footer();?>