Resizable movie/fullscreen

i am looking the way to make my page a full window flash movie, that resizes as the window does. for an example, look at
www.blackpulp.com
or www.ecclesiahouston.org

thats what im looking for, and i know its possible. thanks guys in advance, this is super important!!

http://www.kirupaforum.com/forums/showthread.php?t=64379&highlight=blackpulp