IE6 + https + Control.Modal = error

I have the following source in a web page accessed via SSL using IE6:

<script type="text/javascript" src="prototype.js"></script>
<script type="text/javascript" src="livepipe.js"></script>
<script type="text/javascript" src="window.js"></script>

       $$('.modal').each(function(link){
       new Control.Modal(link,{
                       className: 'modal',
                       overlayOpacity: 0.75,
                       iframeshim: false
           });
   });
       Control.Modal.close();

This works fine in Firefox & Safari, but not in IE6. In IE6, I get two dialog boxes in a row that say:

"This page contains both secure and nonsecure items. Do you want to display the nonsecure items?"

And then, whether I choose "Yes" or "No", I get:

"Internet Explorer cannot open the Internet site . . . [snip] . . . Operation Aborted"

Nothing is displayed on the resulting page.

I noticed that if I delete the following code from window.js, the errors go away and I can see the web page, albeit with errors:

        updateIFrameShimZIndex: function(){
               if(this.iFrameShim)
                       this.iFrameShim.positionUnder(this.container);
       }

Any suggestions on how to work around this?

####

you can solve it by putting your code on a function and call it from

. That solves the IE error. There are some pages that talks about that, I'm not an expert but somthing in window.js appends a child into body and shouldn't or something.