CoffeeCup Image Mapper 5.0

Does this, or other, Image Mapper allow the code to be generated (or regenerated) for the same image at different pixel sizes? My users have a variety of pixel monitor sizes - I'd like to accommodate them all. My current problem is if I scale an image to perfectly fit an iPad, create an image map for it, then it's too small when viewed on a large desktop monitor. So I'd like a tool which will allow me to convert or regenerate the code - or auto adjust to the users display size. Ideas ?