How do I programmatically set all <object>'s to have the wmode set to opaque?

Question

I have a client who is embedding videos into his WordPress blog. The problem is they have a large CSS dropdown that sneaks behind the flash video. I understand that setting

Answer 1

To avoid confusion with all the edits I've done to my previous answer, I'm creating a new answer with a fully tested and working sample page. It has been tested and is working in IE 6, 7 & 8, Opera 9.6 & 10, Safari 3 & 4, Google Chrome, but no version of Firefox I tested (2, 3 or 3.5):

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