When you create an image map, you link different parts of the image to separate destinations. However, some older browsers such as Mosaic and earlier versions of Internet Explorer and Netscape Navigator do not support the client-side image map. You also might consider using several individual images as links instead of an image map. To create either kind of image map, you need to assign hotspots to the image.
Hotspots are hypertext areas on an image map that people can click to jump to different URLs.
When someone clicks on the image map but doesn't click on a particular hotspot, the default link is activated. Click the Behavior tab, if necessary. Click the Image Map radio button, and then click the Edit button. The image file opens in the Image Map Editor. Use the Zoom pop-up menu to increase the magnification of the image.