How to implement process bar in jsp?

Hi, many of us has met this application: when we intall a software, there is a bar which descibes how much is already installed,and how much is left. I am just wondering can we implement such application in jsp pages when there is an operation(such as querying database) which may consume lots of time?

This gets asked every once in a while here.
Search this and the servlets forum and you'll find a few discussions with different approaches.

A quick Google search brought this article up:
http://www.onjava.com/pub/a/onjava/2003/06/11/jsp_progressbars.html

Thanks a lot!