Additional Resources
Providing alternative links when using the OBJECT element - WAI recommended technique.
Alt text and client side image maps - CAST recommended technique.
View WAI Checkpoint 1.2 - Provide redundant text links for each active region of a server-side image map.
View WAI checkpoint 9.1 - Provide client-side image maps instead of server-side image maps except where the regions cannot be defined with an available geometric shape.