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function phptemplate_comment_wrapper($content = '') {
  global $node_bits;
  static $output = '';
  
  if (!$output) {
    $output = _lumen_callback('comment_wrapper',
      array(
        'title'                   =>  $content ? ($node_bits['type'] != 'forum' ? t('Comments') : '') : '',
        'comment_header'            =>  theme('blocks', 'comment_header'),
        'comment_footer'            =>  theme('blocks', 'comment_footer'),
        'classes'                 =>  $node_bits['type'] .'-comments',
        'content'                 =>  $content,
        // No point in having topic navigation if there are no comments to scroll down through.
        'forum_topic_navigation'  =>  $content ? theme('forum_topic_navigation') : '',
      )
    );
  }
  else {
    return $output ? $output : theme_comment_wrapper($content);
  }
}