qTip is my favorite jQuery plug-in to add popup tooltips to your website. When your user hovers a mouse over a tip-enabled word or graphic, a popup tooltip appears to provide help or clarification.

You can see it in action on a site I built at eZenTea.com. Just hover a product in the catalog and a popup tooltip explains details about it, making it easy for shoppers to compare teas without having to go to each product's page.

What's great about qTip is you can style the popup balloon to look anyway you need to match the design of your website, using CSS. It can be a simple small box, a speech balloon with a pointer, and so on. qTip lets you adjust where the pop-up tooltip appears: above or below, left or right or center.

You can learn more about qTip popup tool tips at qTip Website