Nitobi Callout
Nitobi Callout is a rich, skinnable tool-tip and messaging component that prompts users with real-time feedback and helpful instructions as they navigate through a web application. The Ajax-powered component provides fully skinned user alerts, binds to almost any HTML element, and automatically positions callouts in the user's view. Nitobi Callout requires minimal coding and effort. Nitobi Callout is available as part of the Nitobi Complete UI suite, http://www.nitobi.com/pro ducts/completeui/