Youtube Hack

To make the video play automatically (like it does on the youtube page) add &autoplay=1 to both of the youtube url codes above.

So you would change http://www.youtube.com/v/6gmP4nk0EOE to http://www.youtube.com/v/6gmP4nk0EOE&autoplay=1

If you want the youtube clip to automatically restart and loop when done then add this additional modifier to the url: &loop=1

Therefore, you would change all the youtube urls to this:
http://www.youtube.com/v/6gmP4nk0EOE&autoplay=1&loop=1