Since its the size of the window
Hi,
Since its the size of the window which is defining the size of the image thus it is not possible to do it using IMG MAP, flash can be a solution to this but it will be an extensive one where the login you will be implementing will be - pick the size of the window, pick the size of the resized image and find proportionate coordinates for the hyper links on the image.
It will be very tough and complex task as the dependency is user who is resizing the window, plus another thing that you will have to consider will be the browsers.
Cheers.
Maneet puri
LeXolution IT Services
Web Development Company