Issue with back button not returning

[rwoody]

I used the latest version of "about us" here's the tpl_new_product_info_default.php that I created

<?php
/**
 * Page Template
 *
 * Loaded automatically by index.php?main_page=new_product_info.<br />
 * Displays New Product Info page.
 *
 * @package templateSystem
 * @copyright Copyright 2003-2006 Zen Cart Development Team
 * @copyright Portions Copyright 2003 osCommerce
 * @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
 * @version $Id: tpl_new_product_info_default.php  v1.0 $
 */
?>
<div class="centerColumn" id="new_product_info">
<h1 id="newProductInfoHeading"><?php echo HEADING_TITLE; ?></h1>

<div id="newProductInfoHeading" class="content">
<?php
/**
 * require the html_define for the new_product_info page
 */
  require($define_page);
?>
</div>

<div class="buttonRow back"><?php echo zen_back_link() . zen_image_button(BUTTON_IMAGE_BACK, BUTTON_BACK_ALT) . '</a>'; ?></div>