Text to change as rollover certain areas


I have a movie clip that scrolls back and forth upon rollover. It is constricted to a certain area and the AS that I am using is the following:

// Starts the dragging
_root.mc1.onRollOver = function() {
_root.mc1.startDrag(false, 40, 149, 660, 149)

// Stops the dragging

What I would like to do is have the message inside this movie clip change as it rolls over certain areas. How can I accomplish this? Do you know of any tutorials that can show me how to do this? An excellent example can be found at www.andytitus.com.

I attached my fla so you can see how it works so far.

Any suggestions whatsoever would be awesome!