Could be The Simplest jQuery Tooltip Ever

That’s right, this is probably the easiest way to add tooltips to your site. What I really like about this is that you can add a tooltip a link and when you hover over it you will see a screenshot of that link.

Link: http://cssglobe.com/post/1695/easiest-tooltip-and-image-preview-using-jquery

Demo1: http://cssglobe.com/lab/tooltip/01/

Demo2: http://cssglobe.com/lab/tooltip/02/

Demo3: http://cssglobe.com/lab/tooltip/03/