Flash Center Positioning

Hi Guys, I dont know if i am over thinking this, or just been dumb!
But I want to position a flash file in the center of my screen.

However heres the catch, my flash file is 1900 pixels wide, and of course a screen can be anything wide.I can get CSS background images for divs ok, but not objects like a flash movie.

So assuming my screen is 1600 wide, the user would see the center of my 1900 wide flash file with 150 pixels missing on the left aand right.

For some reason, maybe i am tired, but i can not get it working or get my head into gear today.

thanks for any input!