It's called an IMAGE MAP. One big image to which you add several HOTSPOTS (linked regions) using the circle, polygon or rectangle tools. Then you link the various hotspots to their corresponding web pages or full-size images.
Thanks for this Nancy.
Now that I have the images linked on the map I would like to constrain the size of the window that the image opens in. Can you help me with that?
I've tried several options and nothing is working.
Use the Behaviors Panel. This link shows how.