category_row.php modification

I'm trying to modify category_row.php so that any products in bottom level categories will show up like this:

--------Sub Category ---------
--Sub1--
All products
--Sub 2--
All products and on for as many bottom level categories and products there are.

So far i have the following code:

/**
 * index category_row.php
 *
 * Prepares the content for displaying a category's sub-category listing in grid format.  
 * Once the data is prepared, it calls the standard tpl_list_box_content template for display.
 *
 * @package page
 * @copyright Copyright 2003-2006 Zen Cart Development Team
 * @copyright Portions Copyright 2003 osCommerce
 * @license [url]http://www.zen-cart.com/license/2_0.txt[/url] GNU Public License V2.0
 * @version $Id: category_row.php 4084 2006-08-06 23:59:36Z drbyte $
 */
if (!defined('IS_ADMIN_FLAG')) {
  die('Illegal Access');
}
$title = '';
$num_categories = $categories->RecordCount();
$row = 0;
$col = 0;
$list_box_contents = '';
if ($num_categories > 0) {
  if ($num_categories < MAX_DISPLAY_CATEGORIES_PER_ROW || MAX_DISPLAY_CATEGORIES_PER_ROW == 0) {
    $col_width = floor(100/$num_categories);
  } else {
    $col_width = floor(100/MAX_DISPLAY_CATEGORIES_PER_ROW);
  }
  while (!$categories->EOF) {
    if (!$categories->fields['categories_image']) !$categories->fields['categories_image'] = 'pixel_trans.gif';
    $cPath_new = zen_get_path($categories->fields['categories_id']);
    // strip out 0_ from top level cats
    $cPath_new = str_replace('=0_', '=', $cPath_new);
	
			// *** SET VARIABLE FOR PARENT CATEGORY NUMBER - DISPLAY ALL PRODUCTS IN SUB CATEGORIES MOD  ***
	  $parent = $categories->fields['parent_id'];
	//  echo ' parent id is ' .  $parent; //						************ TESTING USE ONLY *************** REMOVE
	 		// ***END SET VARIABLE FOR PARENT CATEGORY NUMBER ***	
	  
//   $categories->fields['products_name'] = zen_get_products_name($categories->fields['products_id']);
	
		
if ($num_categories >1) { // *** SKIP QUERY IF CATEGORY DOES NOT HAVE SUB CATEGORIES - DISPLAY ALL PRODUCTS IN SUB CATEGORIES MOD***
			
		
		// *** COLLECT CATEGORY ID'S RELEVANT TO PARENT ID - DISPLAY ALL PRODUCTS IN SUB CATEGORIES MOD ***
$base_level_query = "select pc.categories_id	
							from " . TABLE_CATEGORIES . " pc
							where pc.parent_id = $parent";
							
							$base_level = $db->Execute($base_level_query);
							while (!$base_level->EOF){
							$bottom_category=$base_level->fields['categories_id'];
							$base_level->MoveNext();
		// *** END COLLECT CATEGORY ID'S RELEVANT TO PARENT ID ***



		// *** COLLECT PRODUCT DATA STORED IN LOWEST LEVEL CATEGORIES - DISPLAY ALL PRODUCTS IN SUB CATEGORIES MOD ***						
$subcategories_products_query =  "select pc.categories_id, pa.products_id, p.products_id, p.products_image, p.products_tax_class_id, pd.products_name,
                                p.products_date_added, p.products_price, p.products_type, p.master_categories_id
                          		from " . TABLE_PRODUCTS_TO_CATEGORIES . " pa,  " . TABLE_PRODUCTS . " p, "  . TABLE_PRODUCTS_DESCRIPTION . " pd, " . TABLE_CATEGORIES . " pc
						   where pc.categories_id = pa.categories_id
						   and p.products_id = pa.products_id
						   and p.products_id = pd.products_id
						   and pd.language_id = '" . (int)$_SESSION['languages_id'] . "'
						   and pc.categories_id = $bottom_category";			  
                         
		$subcategories_products = $db->Execute( $subcategories_products_query);
		
		// *** COLLECT PRODUCT DATA STORED IN LOWEST LEVEL CATEGORIES

 while (!$subcategories_products->EOF) {

		// ***OUTPUT DATA COLLECTED IN $subcategories_products_query - DISPLAY ALL PRODUCTS IN SUB CATEGORIES MOD ***
		
//print_r($subcategories_products);										************ TESTING USE ONLY *************** REMOVE	******THIS IS POPULATED******
		

     // ***************** NOTHING ENTERED HERE GENERATES OUTPUT TO SCREEN.
	
		$list_box_contents[$row][$col]['params'] = 'class="categoryListBoxContents"' . ' ' . 'style="width:' . $col_width . '%;"';
                                       
    $list_box_contents[$row][$col]['text'] = '<a href="' . zen_href_link(FILENAME_DEFAULT, $cPath_new) . '">' . zen_image(DIR_WS_IMAGES . $subcategories_products->fields['products_image'], $subcategories_products->fields['products_name'], SUBCATEGORY_IMAGE_WIDTH, SUBCATEGORY_IMAGE_HEIGHT) . '</a>'; 
	
$subcategories_products->MoveNext();
}
  }
   $list_box_contents[$row][$col] = array('params' => 'class="categoryListBoxContents"' . ' ' . 'style="width:' . $col_width . '%;"',
                                          'text' => '<a href="' . zen_href_link(FILENAME_DEFAULT, $cPath_new) . '">' . zen_image(DIR_WS_IMAGES . $categories->fields['categories_image'], $categories->fields['categories_name'], SUBCATEGORY_IMAGE_WIDTH, SUBCATEGORY_IMAGE_HEIGHT) . '<br />' . $categories->fields['categories_name'] . '</a>');
}
    $col ++;
    if ($col > (MAX_DISPLAY_CATEGORIES_PER_ROW -1)) {
      $col = 0;
      $row ++;
    }
    $categories->MoveNext();
  }
}	
?>

It will display products in single level categories, it will display all sub categories under a category, but no matter what i try, i cannot get it to display products in the deepest level.

The sql query works because a print_r($variable); shows the data held from the query. If i echo a field, the data is also there, but for some reason i just can't format it to display using $list_box_contents.

Can anyone spot the error i have in here? It's obviously not far off as i have done the hardest part, which is getting the required data from the db...

I've just spent too long looking at it and maybe i overlooked something.

Thanks for any help