导航栏带子导航菜单并且高亮

<div class="nav">
<ul>
<li>
<a href="{siteurl($siteid)}" {if !$catid} class="hover"{/if}>首页</a></li>
{pc:content action="category" catid="0" num="20" siteid="$siteid" order="listorder ASC"}
{loop $data $k $r}
<li>
<a href="{$r['url']}" {if $catid==$r[catid] || $top_parentid==$r[catid]} class="hover"{/if} >{$r[catname]}</a>
{pc:content action="category" catid="$k" num="20" siteid="$siteid" order="listorder ASC"}
<ul>
{loop $data $r}
<li><a href="{$r['url']}">{$r[catname]}</a></li>
{/loop}
</ul>
{/pc}</li>
{/loop}
{/pc}
</ul>
</div>