When using an image as a hypertext link, be sure to use a separate text file to give a description or transcript of the image. If an image map is present on your web page, provide an alternate means for selecting the items contained within the map, placing them directly above or below the image map. Be sure to include instructions for the user. Image maps cannot be used with text-only browsers. If your page is designed using frames, consider offering a no frames alternative which the user can select.
Most text based browsers still have no ability to process HTML frames.