After finding that the popup does not resize correctly because of the statubar not being hidden anymore I hunted down and created another facility (see here). Attached is another new version of the popup_image page (based on osc2.2MS2 page), works in all browsers just like the original and with no flicker etc.
Just drop this new version into catalog and if you want to change the background colour change line 45, to your own class.
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