Calling Accessible Context-Sensitive Help with Unobtrusive DOM/JavaScript: A Help Authoring Guide
http://frank.helpware.net/cshelp/home.htm

Palinkas, Frank M.
helpware.net
2009

Abstract:

This Fast Track tutorial demonstrates two methods to call Context-Sensitive Help in a Web Form. We'll discover how Unobtrusive DOM/JavaScript achieves the desired result in calling Context-Sensitive help, and demonstrate how to keep the Structure, Presentation, and Behavior layers of a web page completely separate from one another ensuring good practice with current web standards and accessibility rules.