How to embed video in flash banner?

Can someone describe this process?

I’m making a banner for a friend and he wants a videoclip to start play when you rollover the mouse.

The video itself is to be located on a server and not in the banner itself.

Can you help? Maybe just the “rough” steps to begin with and then I can return with specific questions if they come up.

I think I might have promised too much to my friend :cowboy: