弹出层掩盖ocx控件

<div id="status" style="display: block;border: 1px solid black;z-index: 1000;position: absolute;background-color: white;width:300px;height:300px">
<iframe style="position:absolute;z-index:-1;width:100%;height:100%;top:0;left:0;scrolling:no;" frameborder="0" src="about:blank"></iframe> 
<br/>
<input name="s1" type="checkbox" value="R"><label for="">紧急</label><br/>
<input name="s2" type="checkbox" value="Y"><label for="">一般</label><br/>
<input name="s3" type="checkbox" value="G"><label for="">良好</label>
</div>