ActionScript 3.0 :: Move One Item In The Movie As The Browser Window Resizes?

I've got a movie with a "next" button. The movie is approximately 1330 px wide. The "next" button needs to move left and right within that width as the browser window is resized. For instance, the browser window starts at greater than 1330px wide so the "next" button is at the far right edge of the movie. The user then resizes the browser down to 800px wide. The "next" button needs to move left to 800px. The entire movie can't resize, only the "next" button in that movie must move.

Here's a link the movie as it currently is. The "next" button shows up after the 2nd click in the sequence. It's the brown arrow on the right. http:[url].....