<div class = 'main-menu'>
 <ul class = 'menu'>
  <li class = 'item1'></li>
  <li class = 'item2'></li>
 </ul>
</div>

<div class = 'main-menu'>
 <ul class = 'menu'>
  <li class = 'item1'></li>
  <li class = 'item2'>
   <div class="adv_categories" id="adv_categories">
     <?php cp_create_categories_list( 'menu' ) ?>
   </div>
  </li>
 </ul>
</div>