Stylish jQuery Tooltip Plugin: qTip

qTip is an unobtrusive jQuery tooltip plugin with a list of nice features.

It has:

• rounded corner support without use of any PNGs
• very flexible tooltip pointers are as they can be positioned in several locations
• 5 ready to use stylish themes & you can create your own easily
• support for not-overlacking. How close the tooltips are, they will preserve their stacking order
• ready to use effects: fade, slide, glow & custom ones can be created

The plugin is cross-browser & tested in all major bowsers. It is also very well-documented.

qTip has with a scripting API that allows you to easily extend the functionality through a variety of optional callback methods & attributes. So, you can even extend qTip by writing plugins for it.