Tooltip let's you create mouse over tooltips to your content and allows you to show additional information.It using Gzip loader technique that will deliver CSS and Javascript files more faster and also with minimun HTTP request.Need MooTools,PHP and a few js.The main code is from YOOtooltip,but YOOtooltip is only used for Joomla CMS.So I changed a little script.

Tip pulls content into a tool tip using the HttpXMLRequest object. By adding a class attribute value of “jTip” to a link element you can create a tooltip from the content found in the file the href is pointing too. Also jTip can be customized by providing user defined widths (defaults to 250px wide) via a url query string. The height is liquid and stretches to match the content that fills the tool tip. Additionally it’s possible to provide a link (via url query string) to a jTip tool tip link element (a href) so that the link will still function as expected by the user. See the Yahoo link in the demo for a working example.

There's a lot of powerful interactivity you can bring to your site using javascript besides slick navigation menus.This plugin of mootools is like tooltip.It's have a pretty cool effect!This example is come from http://nettuts.com/.