[xwiki-users] Main menu z-index problem

Hi everyone, I've got a problem with my main page. I embedded 3 iFrames with a z-index of 2 and 3. In the Firefox Browser everything is working perfectly, but the Internet Explorer (9) is displaying the iFrames on top of the menu points... Here is a piece of code from the menu I am using: {{menu type="vertical" position="left" id="Navigation links"}} {{html}} <span style="font-weight:bolder;font-size:125%">Navigation</span> {{/html}} * [[Navigation 1>>Main.Navigation1]] ** [[News>>Navigation1.News]] ** (...) And here is the code for my iFrames: <div style="position:absolute; top:250px; left:230px; z-index:3;"> <iframe src=" index.html" width="575" height="800" scrolling="no" frameborder="0"></iframe> </div> <div style="position:absolute; top:230px; right:260px; z-index:2;" id="container"> <iframe src=" index2.html" width="500" height="280" scrolling="no" frameborder="0"></iframe> </div> <div style="position:absolute; top:550px; right:250px; z-index:2;" id="accordion"> <iframe src="index3.html" width="650" height="400" scrolling="no" frameborder="0"></iframe> </div> In the colibri.css in the xwiki directory I saw, that the z-index for the menu is =1000... Where is the problem for Internet Explorer to display the menu points ontop of the iFrames? And also: Why does the Internet Explorer put the Navigation points 1cm downwards and displays an empty Navigation point??? Regards, Tom Neumann