Creating additional catalog blocks in Ubercart for Drupal 6

/**
 * Implementation of hook_block().
 */
function MYMODULE_block($op = 'list', $delta = 0, $edit = array()) {
  switch ($op) {
    case 'list':
      $blocks[0]['info'] = t('MY NEW Catalog Block');
      return $blocks;
    case 'view':
      switch ($delta) {
        case 0:
          drupal_add_css(drupal_get_path('module', 'uc_catalog') .'/uc_catalog.css');
 
          // Hardcode the vocabulary for the new catalog block
          $vid = 5;
          $tree = taxonomy_get_tree($vid);
          // Then convert it into an actual tree structure.
          $seq = 0;
          $menu_tree = new UcTreeNode();
          $level = array();
          $curr_depth = -1;
          foreach ($tree as $knot) {
            $seq++;
            $knot->sequence = $seq;
            $knothole = new UcTreeNode($knot);
            // Begin at the root of the tree and find the proper place.
            $menu_tree->add_child($knothole);
          }
 
          // Now, create a structured menu, separate from Drupal's menu.
          $content = theme('uc_catalog_block', $menu_tree);
 
          $subject = t('New Catalog Title Goes Here');
          $block = array('subject' => $subject, 'content' => $content);
          return $block;
          break;
      }
      break;
    }
}