Kill sound from streaming youtube?

Hi Guys,

I finally got a flash file working with youtube video, but I can’t work out how to kill the sound from the youtube video once i remove it from the MC it’s being loaded into.

Here is a link with the code:
http://www.creativelevel.com.au/samsung/sound.html

So basically when I unload the movie, I also want the Youtube video sound to stop.

Thank you!