Adding content to side box

[CoolCarPartsOnline]

Hello
Iam trying to add a new side box to display the top categories as seperate side boxes. I started the testing on one Categorie on my site www.coolcarpartsonline.com Categorie "Performance Parts" ID 239. I was able to get hide the category from the categories sidebox. and Now trying to add content to the New Sidebox to display the Performance parts Categorie. The code I added in the performance_sidebox (I changed the name of the blank_sidebox)

PHP Code:

<?php 
/** 
 * blank sidebox - allows a blank sidebox to be added to your site 
 * 
 * @package templateSystem 
 * @copyright 2007 Kuroi Web Design 
  * @copyright Portions Copyright 2003-2007 Zen Cart Development Team 
 * @license [url]http://www.zen-cart.com/license/2_0.txt[/url] GNU Public License V2.0 
 * @version $Id: blank_sidebox.php 2007-05-26 kuroi $ 
 */ 
/************* 
stuff Sami added to use more performance box 
******************/ 
  $categories_query_ap = "select c.categories_id, cd.categories_name, c.parent_id, c.categories_image 
                             from categories c, categories_description cd 
                             where c.categories_id = cd.categories_id  
                             and c.categories_status = 1  
                             and c.parent_id = 239 
                             order by sort_order, cd.categories_name"; 

    $categories_ap = $db->Execute($categories_query_ap, '', true, 150); 
     
    $add_content =''; 
     
    while (!$categories_ap->EOF)  { 
        $id = $categories_ap->fields['categories_id']; 
        $name = $categories_ap->fields['categories_name']; 
          $add_content .= '<li><a href="index.php?main_page=index&cPath='.$id.'" class="category-top">'.$name.'</a></li>' . "\n"; 
         
        $categories_ap->MoveNext(); 
    } 
     
    unset($name); 
     
/**************** 
end of additions 
********************/ 
  // test if box should display 
  $show_performance_sidebox = true; 

  if ($show_performance_sidebox == true) { 
      require($template->get_template_dir('tpl_performance_sidebox.php',DIR_WS_TEMPLATE, $current_page_base,'sideboxes'). '/tpl_performance_sidebox.php'); 
      $title =  BOX_HEADING_PERFORMANCE_SIDEBOX; 
      $title_link = false; 
      require($template->get_template_dir($column_box_default, DIR_WS_TEMPLATE, $current_page_base,'common') . '/' . $column_box_default); 
 } 
?>

I edited the following files:
category_tree
tpl_categories
tpl_main_page
Plus the files that came with the blank_sidebox Mod.
The sidebox appears on the site Iam just trying to tweak the code to have the content of the Performance Parts Side Box.