phpcms 显示某一栏目的二级栏目

{if $top_parentid}
<div class="subnav">
{pc:content action="category" catid="$top_parentid" num="15" siteid="$siteid" order="listorder ASC"}
{loop $data $r}
<a href="{$r[url]}">{$r[catname]}</a><span> | </span>
{/loop}
{/pc}
<a href="{APP_PATH}index.php?m=video&c=index&a=album">视频专辑</a><span> | </span>
{if $modelid}<a href="{APP_PATH}index.php?m=content&c=search&catid={$catid}">搜索</a>{/if}
</div>
{/if}