smarty tree ul li

{function name=printList}
    {foreach $items key=$key item=$item}
    {if !$key}{break}{/if}
    <li>{$key}
            {if is_array($item)}
            <ul>
            {call name=printList items=$item}
            </ul>
            {else}{break}
            {/if}
    </li>
    {/foreach}
{/function}
<ul class="tree">
{call name=printList items=$ARTTree}
</ul>