HTML 5 VIDEO + JQUERY Swapping between 2 videos including fallbacks, and not working in firefox

html+video files at: dausign.com/clicktohearsound

Howdy, I'm working on a simple video piece where I have a 开发者_如何转开发button that swaps the video and the button disappears. I have 2 videos each with 2 fallbacks. Would anyone know why the video is not showing up in firefox? Also, if I wanted to go back to the first video with the button by clicking in the window, what would be the best way to achieve that? thankseeeeee

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