DIV覆盖DropDownList解决方案（转）

两种解决方案：

(1)在Div中放1个空的iframe
 

HTML code

 <select size="1"> 
<option value="a">a</option> 
<option value="b">b</option>
 </select> 
<div class="f"><iframe width="0" height="0" frameborder="0"></iframe>我是导航菜单，谁敢挡住我?</div>

(2)把DropDownList用Span包裹起来

HTML code

<span style="z-index:-9999"> 
<select size="1"> 
<option value="a">a</option> 
<option value="b">b</option> 
</select>
</span> <div class="f">我是导航菜单，谁敢挡住我?</div>