Flash over html, hide flash access html after flash movie ends

We’ve got a green screened video playing in a flash movie over top of our html content.

when the movie ends, flash uses external interface .api to call a javascript function which swaps the flash movie out with a 5 x 5 pixel flash movie (rewrites the <div>).

this works and you can interact with the html content after the flash movie in all browsers except firefox…!

anyone know of any work-arounds or is there a better way of handling flash over html in this fashion?

any input would be greatly appreciated!