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<div class="fr">
<div class="top"><span class="call"></span><span class="call_tel">0</span>
<a><span class="email"></span>service0</a>
<a class="ewm"><span class="weixin"></span>微信公众号 <img src="{THEME_PATH}Public/Web/images/contact_weixin.jpg" width="258" height="258" alt="方维网络微信公众号" /></a>
</div>
<nav class="nav">
<ul class="fix">
<li id="menu1">
<a href="{SITE_URL}" title="{SITE_TITLE}">首页</a>
</li>
{list action=category module=share pid=0}
<li id="menu2">
<a href="{$t.url}" title="{$t.name}">{$t.name}</a>
</li>
{/list}
</ul><span class="nav_icon"></span></nav>
</div>
</div>
</header>
<script type="text/javascript">
document.getElementById("menu1").className = "on";
</script>
现在问题是 打开导航都是默认显示 首页
怎么做到 我打开 产品 导航 然后对应导航呢