IE js方法触发问题？
<ul>
<li onclick="showmenu2('1')">Pet food series</li>
<div class="products_1" id="list1_1" style="display:none;" >
<ul>
<li ><a href="mcs.html" target="prIframe" onclick="click_mcs()">Meat Cubes Series</a></li>
<li><a href="../products.html" target="_parent">Calcium Food</a></li>
</ul>
</div>

<li id="move1"><a href="../products.html" target="_parent">cat food series</a></li>
<ul>

IE浏览器为什么在
<div class="products_1" id="list1_1" style="display:none;" >
<ul>
<li ><a href="mcs.html" target="prIframe" onclick="click_mcs()">Meat Cubes Series</a></li>
<li><a href="../products.html" target="_parent">Calcium Food</a></li>
</ul>
</div>
里面也能触发showmenu2('1')方法？其他浏览器不触发是正常的 如何解决？

------解决方案--------------------
估计是冒泡了。。阻止下。。。