Simple to use tooltips

. jQuery tools tooltip
Easily create simple or complex tooltips, adding some cool effects to it.

HTML Tooltip
Inline HTML Tooltip lets you define rich HTML tooltips that are embedded directly inside your webpage using css.

Cool Tooltips
Lightweight unobtrusive JavaScript web-browser tooltips replacement technique.

Display tooltip messages from HTML elements, Ajax calls or text added manually.

BlogFish’s tooltip
Totally flexible tooltip with Prototype.