Designing accessible web site is an important part of improving usability. "Section 508" has established rules that the government must follow to assure that technology is accessible to all citizens. Most of those rules, know as "508" web guidelines, are good practice for any web site. The SkipNav (or skip navigation) allows people using screen readers (software that reads the text on the web page (for the blind, for example) to skip the site navigation that often appears at the top of every page. Without it the reader has to read through each of the links on every page before it starts reading the navigation.

The way to improve the accessibility of your site is to use an intra page link that will skip to the begining of the content of the page. For example, see:

This can also be done using a text link, rather than an image. You can make the text link visible (or make it invisible by making the font on the text in the link the same color as the background).