CoolTips - lightweight JavaScript tooltips
CoolTips is a lightweight unobtrusive JavaScript web-browser tooltips replacement technique. CoolTips is used to replace conventional web-browser tooltips. The tooltips get contents of title attribute, so it’s fully unobtrusive. CoolTips is an OO class based on Prototype JS and script.aculo.us frameworks.
Demo: http://okonet.ru/projects/tooltips/
License: MIT License