Drupal 6 Custom content type page theme

/**
  
       * Override or insert PHPTemplate variables into the templates.
  
       */
 
      function phptemplate_preprocess_page(&$vars) {
 
        // Add per content type pages
 
        if (isset($vars['node'])) {
 
          // Add template naming suggestion. It should alway use hyphens.
 
          // If node type is "custom_news", it will pickup "page-custom-news.tpl.php".
 
          $vars['template_files'][] = 'page-'. str_replace('_', '-', $vars['node']->type);
 
        }
 
      }