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Display image while page loads

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I have a JSP which sends a request(through javascript) to an action class,Which generates a reports and displays it on a page
The report generation takes a lot of time ,I want to show a GIF saying its loading while the report generation happens
An onload event on the result body wont work because the control doesnt go to the page till the whole page is loaded

In the same way i also have a PDF being generated by writing to a stream which takes time and just opens a OPEN/SAVE/CANCEL dialog box directly
If possible i also want to show an image in this case also

Can some one suggest me possible solutions

Thank you
(The project is a struts 1.2 project)
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