Information popup box

I'm looking for an information popup box l开发者_如何转开发ike here on this site:

Yahoo answers example

Here if you hover mouse on question author or answer author usernames small nice popup box will appear, that queries some information with ajax. I need exactly the same thing... I need to display small popup box when the mouse is over the link and call some information from database.

Do you happen to have javascript for that?

here is a list of plugins you can use with jQuery: 30 Stylish jQuery Tooltip Plugins For Catchy Designs