comment_form_box in drupal-6.x/modules/comment/comment.module

Theme the comment form box.

search_view in drupal-6.x/modules/search/search.pages.inc

Menu callback; presents the search form and/or search results.

theme_comment_controls in drupal-6.x/modules/comment/comment.module

Theme comment controls box where the user can change the default display mode and display order of comments.

<?php

/**
 * @file box.tpl.php
 *
 * Theme implementation to display a box.
 *
 * Available variables:
 * - $title: Box title.
 * - $content: Box content.
 *
 * @see template_preprocess()
 */
?>
<div class="box">

<?php if ($title): ?>
  <h2><?php print $title ?></h2>
<?php endif; ?>

  <div class="content"><?php print $content ?></div>
</div>