Here we will guide you through the checkpoints of priority one of the "W3C Web Content Accessibility Guidelines 1.0".

Point 1.1:

Provide a text equivalent for every non-text element. This includes: images, graphical representations of text, image map regions, animations, applets and programmatic objects, ascii art, frames, scripts, images used as list bullets, spacers, graphical buttons, sounds, stand-alone audio files, audio tracks of video and video.

Point 1.2:

Provide redundant text links for each activ region of a server-side image map.

Point 1.3:

Until user agents can automatically read aloud text equivalent of a visual track, provide an auditory description of the important information of the visual track of a multimedia presentation.