<ul class="fr nav_menu">
<li {if !isset($catid)} class="now" {/if}><a href="{SITE_URL}">首頁</a></li>
{m:nav field="catid,catname,arrchildid,pclink" where="parentid=0" limit="20"}
{loop $data $v}
{php $child_arr = explode(',', $v['arrchildid']);}
<li {if isset($catid) && in_array($catid, $child_arr)} class="now" {/if}><a href="{$v[pclink]}">{$v[catname]}</a></li>
{/loop}
</ul>
<ul class="fr nav_menu"> <li ><a {if !isset($catid)} class="now" {/if} href="{SITE_URL}">首頁</a></li> {m:nav field="catid,catname,arrchildid,pclink" where="parentid=0" limit="20"} {loop $data $v} <li ><a {if isset($catid) && in_array($catid, explode(',', $v['arrchildid']))} class="now" {/if} href="{$v[pclink]}">{$v[catname]}</a></li> {/loop} </ul>