how can I rename this ads_display2.php code?

Hi all,
I need help, am not very familiar with coding but am learning.

I would like to change a "2" in ads_display2.php to call the category id"

<?php require($template->get_template_dir('',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/ads_display2.php'); ?>

am using it here;

<?php /** * Page Template * * Loaded by main_page=index<br /> * Displays category/sub-category listing<br /> * Uses tpl_index_category_row.php to render individual items * * @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_index_categories.php 4678 2006-10-05 21:02:50Z ajeh $ */ ?> <div class="centerColumn" id="indexCategories"> <?php if ($show_welcome == true) { ?> <h1 id="indexCategoriesHeading"><?php echo HEADING_TITLE; ?></h1> <?php if (SHOW_CUSTOMER_GREETING == 1) { ?> <h2 class="greeting"><?php echo zen_customer_greeting(); ?></h2> <?php } ?> <!-- deprecated - to use - uncomment <?php if (TEXT_MAIN) { ?> <div id="" class="content"><?php echo TEXT_MAIN; ?></div> <?php } ?>--> <!-- deprecated - to use - uncomment <?php if (TEXT_INFORMATION) { ?> <div id="" class="content"><?php echo TEXT_INFORMATION; ?></div> <?php } ?>--> <?php if (DEFINE_MAIN_PAGE_STATUS >= 1 and DEFINE_MAIN_PAGE_STATUS <= 2) { ?> <div id="indexCategoriesMainContent" class="content"><?php /** * require the html_define for the index/categories page */ include($define_page); ?></div> <?php } ?> <?php } else { ?> <h1 id="indexCategoriesHeading"><?php echo $breadcrumb->last(); ?></h1> <?php } ?> <?php if (PRODUCT_LIST_CATEGORIES_IMAGE_STATUS_TOP == 'true') { // categories_image if ($categories_image = zen_get_categories_image($current_category_id)) { ?>

<div class="center_slider"><?php require($template->get_template_dir('',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/ads_display2.php'); ?><?php //echo zen_image(DIR_WS_IMAGES . $categories_image, '', SUBCATEGORY_IMAGE_TOP_WIDTH, SUBCATEGORY_IMAGE_TOP_HEIGHT); ?></div>

<?php } } // categories_image ?> <?php // categories_description if ($current_categories_description != '') { ?> <div id="categoryDescription" class="catDescContent"><?php echo $current_categories_description; ?></div> <?php } // categories_description ?> <!-- BOF: Display grid of available sub-categories, if any --> <?php if (PRODUCT_LIST_CATEGORY_ROW_STATUS == 0) { // do nothing } else { // display subcategories /** * require the code to display the sub-categories-grid, if any exist */ require($template->get_template_dir('tpl_modules_category_row.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_modules_category_row.php'); } ?> <!-- EOF: Display grid of available sub-categories --> <?php $show_display_category = $db->Execute(SQL_SHOW_PRODUCT_INFO_CATEGORY);

while (!$show_display_category->EOF) {
// // echo 'I found ' . zen_get_module_directory(FILENAME_UPCOMING_PRODUCTS);

?>

<?php if ($show_display_category->fields['configuration_key'] == 'SHOW_PRODUCT_INFO_CATEGORY_FEATURED_PRODUCTS') { ?> <?php /** * display the Featured Products Center Box */ ?> <?php require($template->get_template_dir('tpl_modules_featured_products.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_modules_featured_products.php'); ?> <?php } ?> <?php if ($show_display_category->fields['configuration_key'] == 'SHOW_PRODUCT_INFO_CATEGORY_SPECIALS_PRODUCTS') { ?> <?php /** * display the Special Products Center Box */ ?> <?php require($template->get_template_dir('tpl_modules_specials_default.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_modules_specials_default.php'); ?> <?php } ?> <?php if ($show_display_category->fields['configuration_key'] == 'SHOW_PRODUCT_INFO_CATEGORY_NEW_PRODUCTS') { ?> <?php /** * display the New Products Center Box */ ?> <?php require($template->get_template_dir('tpl_modules_whats_new.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_modules_whats_new.php'); ?> <?php } ?> <?php if ($show_display_category->fields['configuration_key'] == 'SHOW_PRODUCT_INFO_CATEGORY_UPCOMING') { ?> <?php include(DIR_WS_MODULES . zen_get_module_directory(FILENAME_UPCOMING_PRODUCTS)); ?><?php } ?> <?php $show_display_category->MoveNext(); } // !EOF ?> </div>