In order to have rollOvers we need buttons.  To do this I created a simple rectangle, selected it and hit F8 to make it a MovieClip called button, and gave it an instance name of button0.  I opened up that button and made a red rectangle (again use the example as a guide) and then selected it, hit F8 to select it and called it scaler with an instance name of scaler.  Then in my root I selected  button0 and copied it twice so now there are three buttons on the stage with instance names of button0, button1, and button2.

Now lets code!