Repeating Backgrounds within 100% width/height flash files

Working on a new clients web site, and we have decided to go all flash instead of flash/xhtml hybrid. Now I know how to use CSS to repeat a 2px background across the page.

What I would like to do, and am trying to figure out for this flash site is how to do the same thing as I could in CSS. That is make the background 2px wide and 1600px tall (or whatever), then make that repeat in the background.

The content within the flash file will not scale, with the site, only this gradient background.

Help is appreciated. Cheers,