Abstract: An image map designer creates an image map for use with an image. The image map contains one or more hotspots, each of which specifies a set of pixels which may be non-contiguous and non-polygonal. The image map designer may create the image map using image processing software that facilitates creation of non-contiguous and non-polygonal image maps. Multiple versions of the image map may be created, each for use with a different magnification of the image. The image maps are stored in a compact format, which may be transmitted efficiently from a server to a client. Data contained within the image map facilitates the process of determining whether the client user's mouse pointer is within any of the hotspots, and the process of applying the image map to the image when rendered at different magnifications.