// pro tebe nepodstatne
    public function getCategoryTree($configuration, $where = '', $order = '') {
        // nepodstatne
        $order = ((!$order) ? '`sortOrder` ASC' : $order);

        // ziskani zaznamu, ktere chces poskladat do stromu
        // u tebe to bude proste nejaky select * from ?
        $categories = Category::getCategories($configuration, $where, $order);
        
        $tree = array();
        $hash = array();
        
        foreach ($categories as $category)
        {
            $item =
                array(
                    'id'          => $category->getId(),
                    'name'        => $category->getName(),
                    'children'    => array()
                );

            $hash[$category->getId()] = $item;
        }
                
        foreach ($categories as $category)
        {
              if ($category->getParentId() && $hash[$category->getParentId()])
              {
                $hash[$category->getParentId()]['children'][] =& $hash[$category->getId()];
              }
              else
              {
                $tree[$category->getId()] =& $hash[$category->getId()];
              }
        }
        
        return $tree;
    }