Full Width Site

I want to create an opening effect like the one here:

http://www.2advanced.com/

Where the site expands from a horizontal line that goes across the screen - I cannot figure out how to make a flash site that takes up the full width of the screen without the movie automatically scaling everything in it. For example, if I have a 200X200 square in flash and I double the size of the screen, the square becomes 400X400.

Can anyone provide any insight? Thanks.