Accessible Context-Sensitive Help with Unobtrusive DOM Scripting

This article demonstrates two methods of calling context-sensitive help in a web form: the Field Help Method and Form Help Method, in which unobtrusive DOM/JavaScript is employed to achieve the desired result. It also serves to illustrate the separation of the Structure and Behavior layers of a web page. Graceful degradation is employed to make sure that the help information is accessible if JavaScript is disabled or not available in a user agent.

Palinkas, Frank M. Opera (2008). Articles>Web Design>Standards>Help