织梦(dedecms)导航条dropdown.js的改进(2)

document.write('<IFRAME id="iframeshim" src=http://www.dede58.com/"" style="display: none; left: 0; top: 0; z-index: 90; position: absolute; filter: progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)" frameBorder="0" scrolling="no"></IFRAME>'); 

this.shimobject = document.getElementById("iframeshim");