{if:$article_tree_is_open,eq,1}
<div class="menu">
  <ul>
    {for:$i,0,$tree_u}
    <li><a href="{$C_ROOT}?article_{$tree[$i]['id']}_0_0.html">{$tree[$i]['name']}</a></li>
    {/for}
  </ul>
</div>
{/if}