Flush output to browser before long process

I'd like to display a message on the browser to ask the user to keep waiting while the system is performing a long process. I'm using JSP's flush(), but it doesn't work, the browser just shows an blank page while processing.
Is there any way to flush the output so that the browser shows some info instead of blank page?

Many thanks.
andersyAsked:
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COBOLdinosaurConnect With a Mentor Commented:
You have to modify th eclient page before submitting to the server side process.  just put a hidden layer on the submitting page, and just before you submit display the hidden laye, which should then stay up until teh browser get the response page back.

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