Вопрос Категории Prestashop на главной странице?

<?php

/*
*  @author Ilia Ilin <admin@blogun.biz>
*  @copyright  2013
*  @version  1.0
*/

if (!defined('_PS_VERSION_'))
	exit;


class BlockHomecategorys extends Module
{
	public function __construct()
	{
		$this->name = 'blockhomecategorys';
		$this->tab = 'front_office_features';
		$this->version = '1.0';
		$this->author = 'ILIL';

		parent::__construct();

		$this->displayName = $this->l('Categories block');
		$this->description = $this->l('Adds a block categories to Homepage.');
	}

	function install()
	{
	    if (!parent::install() || !$this->registerHook('displayHeader') || !$this->registerHook('displayHome'))
		return false;
	    return true;
	}

        public function hookDisplayHeader()
        {
            $this->context->controller->addCSS(_THEME_CSS_DIR_.'category.css', 'all');
        }
        
	public function hookDisplayHome($params)
	{
            $categoryRoot = new Category(Configuration::get('PS_HOME_CATEGORY'),$this->context->language->id,$this->context->shop->id);
            $categoriesHome = $categoryRoot->getSubCategories($this->context->language->id);
            
            $this->smarty->assign(array(
                'subcategories' => $categoriesHome,
                'homeSize' => Image::getSize('medium_default')
            ));
            
            return $this->display(__FILE__, 'blockhomecategorys.tpl');
	}

}

{if isset($subcategories)}
  <h2>{l s='Categorys' mod='blockhomecategorys'}</h2>

  <div id="subcategories">
    <ul class="inline_list">
      {foreach from=$subcategories item=subcategory}
	  <li class="clearfix">
	    <a href="{$link->getCategoryLink($subcategory.id_category, $subcategory.link_rewrite)|escape:'htmlall':'UTF-8'}" title="{$subcategory.name|escape:'htmlall':'UTF-8'}" class="img">
	    {if $subcategory.id_image}
		<img src="{$link->getCatImageLink($subcategory.link_rewrite, $subcategory.id_image, 'medium_default')}" alt="" width="{$mediumSize.width}" height="{$mediumSize.height}" />
	    {else}
		<img src="{$img_cat_dir}default-medium_default.jpg" alt="" width="{$mediumSize.width}" height="{$mediumSize.height}" />
	    {/if}
	    </a>
	    <a href="{$link->getCategoryLink($subcategory.id_category, $subcategory.link_rewrite)|escape:'htmlall':'UTF-8'}" class="cat_name">{$subcategory.name|escape:'htmlall':'UTF-8'}</a>
	  </li>
      {/foreach}
    </ul>
    <br class="clear"/>
  </div>
{/if}