image swap based on relative cursor position?

image swap based on relative cursor position?

Hi all,

I'm learning jquery and attempting an "about us" page similar to the one seen here:

http://www.abm.at/de/akteure

I don't need this level of detail, but I am trying to figure out how I can swap an image based on the relative position of the cursor. I have read about the mouse tracking function, so my best guess is there's a way to filter this into another function but I am really not sure. Can anyone provide the basics of how this might be attempted?

Thanks a lot