function display_categories($cat_array)
{
  if (!is_array($cat_array))
  {
     echo 'No categories currently available<br />';
     return;
  }
  echo '<ul>';
  foreach ($cat_array as $row)
  {
    $url = 'show_cat.php?catid='.($row['catid']);
    $title = $row['catname']; 
    echo '<li>';
    do_html_url($url, $title); 
    echo '</li>
  }    
  echo '</ul>';
  echo '<hr />';
}