The description given in the text should be very simple. Often, it is easier to describe the function than the appearance of the graphic. It is also recommended that a text-only list of links be provided immediately below the map. Blind and visually impaired users generally encounter no problems with audio clips. However, they can create many problems for hearing impaired or technologically challenged users.
Video clips are almost completely inaccessible to blind and visually impaired users.
If video is used, either a descriptive text transcript or timed, closed captioning should be used in conjunction with the clip. The use of Java causes several problems with accessibility that are too large to go into here. If you have to use Java on your Web documents, you should read a report prepared by the Trace Institute, which details accessibility problems with Java. Test all documents with a variety of browsers and with images turned off. A number of excellent resources on the Web provide much more detailed information for designing accessible Web sites than has been offered here.