Video with no background in flash

Hi Guys,
I was wondering if there were any tutorials to do the following:
play a video in flash? with no background. So say the video is of a guy talking and the website is behind him…Then I can take the swf and put it on the site…
you can go to this site to see what I am trying to describe…you will have to go through a few steps to get to the character to come on screen…
http://www.thegoodfoodfight.com

Thanks