{foreach from=$index item=top}
  <ul class="nav">
    {foreach from=$top.children item=level1}
      {navItem page=$level1 active=$id}{if $level1.children}
      <ul class="subnav">
        {foreach from=$level1.children item=level2}
          {navItem page=$level2 active=$id}</li>
        {/foreach}
        <span class="nav-rounded-bottom"></span>
      </ul><!-- end nav_level_2 -->{/if}</li>
    {/foreach}
  </ul><!-- end nav_level_1 -->
{/foreach}