Custom image selector IE8?

Hi,

I am using a custom file browser (using a pop-up window) and once an image is clicked the following javascript is called:

window.opener.CKEDITOR.tools.callFunction(2, '<?php echo $path ?>', 'Image');
self.close();

Once this is clicked then the source URL should be filled out and the image loaded in the preview. This is working perfectly in Firefox but does not work in Internet Explorer 8. The window closes but the source url is not filled out.

Any ideas?

Thanks,
Thom.