{assign var = 'currentPage' value = "$BASE_URL/$CURRENT_PAGE"}
<ul class="nav nav-tabs" id="classifieds">
    {foreach from = $item->subPageUrls item = "url" key= 'label'}
        <li{if $currentPage eq $url} class="active"{/if}><a href="{$url}">{$label}</a></li>
    {/foreach}
</ul>