iframe的显示和隐藏

    <div id="bodyframe" style="visibility:hidden">
      <iframe id="ifm1" src="Default2.aspx" style="z-index: 100; left: 188px; position: absolute; top: 175px"></iframe>
     </div>
    
    <div onclick="document.all.bodyframe.style.visibility='visible'" style="background-color: red; cursor: hand; height: 22; left: 100; position: absolute; top: 137; width: 74; z-index: 1">
显示iFrame
</div>
<div onclick="document.all.bodyframe.style.visibility='hidden'" style="background-color: red; cursor: hand; height: 22; left: 161px; position: absolute; top: 83px; width: 74; z-index: 2">
隐藏iFrame
</div>