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I have just tried with an embedded video in Before and a YouTube video in After.

For the Before link, I used popup: close "After" open "Before"
For the After link, I used popup: close "Before"...

Gary, I was reluctant to advise using the source target approach when the video itself is to be on a pop-up layer, simply because I have not tried it out fully.

In principle, it should work.
...

It was worth a try!

Acorn

Try deleting the class="xar_meplayer" part.
It may help.

Acorn