Zoom in/out

Hi there,

I have a quick question - how do you create a zoom in/out effect in Flash, much like the one in this game: http://nonoba.com/yaief/race-to-the-bottom

I want the “camera” to follow the two objects each player control, and get closer and farther as they move … and I have no clue how to do it.

As usual, thanks a bunch!