How to show a Progress Bar while operation is being executed

Hi

I have a JSP page made of HTML and some Javascript .

When i click on a button (Add button its related to my Application logic) , the operation is taking some time , so in mean time i want to show the user Progress Bar related to the Operation , please let me know how can i implement this ??

Thanks in advance .

The operation is place where? The button is doing what exactly?

Very limited details = very bad answers.

Eric

Or no answers.

Or no answers.

The operation is place where? The button is doing what exactly?

Sorry , i did not post this as i thought this is all related to Other tiers of the Application .

Okay , The Add button of my application will be responsible to Add an User in Oracle Database ,(for this it executes two insert queries).
The flow is of JSP -->Servlet--->SessionBeans---->ServiceLayer---->Hibernate---->Database .