warning user for session time out

The user in my application has to write long applications. So if while writing the application, session gets times out. what should be done.

how a window can be poped-up saying that your session will get timed-out in 5 minutes. if the user says yes, we will submit a blank form.. but this will become a recursive thing too

any other way we can achieve this

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[386 byte] By [abhinav_nigam19a] at [2007-11-27 5:17:57]