Masking issue

I am trying to create a Flash piece in which I am creating a dual monitor. Instead of having the monitors set up side-by-side, though, the monitors are placed one on top of the other. I’ve set it up so that the monitors themselves are masks and the arrow is under the mask. The problem I have, though, is that I want the arrow to automatically appear on the opposite screen when it scrolls off one edge. For instance, when the icon is in the top screen, if the user moves the mouse off the bottom edge of that mask, it should automatically appear on the bottom screen. What happens now is that the mouse disappears for a while when it’s between the 2 monitors. How do I code this to determine when the cursor has left one of the masks and move it to the other?

Chris

I’ve attached an image to give an idea of what my dual monitor will look like.