Building Accessible Static Navigation with CSS
http://dev.opera.com/articles/view/building-accessible-static-navigation-wi/

Palinkas, Frank M.
Opera
2008

Abstract:

When building a navigation menu for a web site, steps should be taken to ensure that it is accessible, and degrades gracefully in older browsers with lesser CSS support. In this article we will explore one such implementation. The navigation menu you see in this example is built with valid, semantic HTML and CSS - no JavaScript is involved, as I felt this was unnecessary. The static (non-expanding/collapsing) nature of the example suits a web site comprised of twenty or less target pages.