Design web pages? Check out OverLIB. From their website:
What is overLIB
overLIB is a JavaScript library created to enhance websites with small popup information boxes (like tooltips) to help visitors around your website. It can be used to provide the user with information about what will happen when they click on a link as well as navigational help (see the examples below). Not to mention that it looks cool, is stable, and has an active developer community to boot!
Downloaded the software and it looks pretty slick -- very low overhead and much better than other pop-ups built into the HTML spec. (I'm thinking specifically of the "acronym" tag which works but has no formatting options and is slow to display...)
