Everyone does not use a graphical pointing device such as a mouse. Some people use voice commands. Some use a keyboard. Page Authors can help by using Client Side image maps with ALT tags, rather than Server Side Image Maps. See the Techniques for Web Content Accessibility Guidelines .
Blind users find it difficult or impossible to navigate forms that have unlabeled elements.
Avoid using Tables for Layout . Screen readers, telephone browsers and some other Internet Agents have difficulty with tables. Use Cascading Style Sheets for page layout whenever possible. See the Web Access Initiative for instructions. In addition to being inaccessible in a text-only broswer, frames have several isses with conventional broswers as well.