Preview info on mouse over on an image How can I get the effect like on StackExchange where user information is displayed when you hover over their avatar? 

I have a site that only has images on the front page, and would like the user to be able to get some information about the image before they click through.

I am using Drupal 7.
Also you can use qTip


  qTips are stylish tooltips that can be configured and styled (more to
  come in later releases) to fit nearly any website's design.