user click on Continue on message, then the user needs to continue with work

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ASP.NET

Hi Friends,

I am using VS 2005,C#,asp.net, .net framework 2.
I have mentioned session timeout in webconfig as 20.
I want to get a message before sessiontimeout (say 2 minutes before timeout).
If a user click on Continue on message, then the user needs to continue with what user is doing.No interruption for the work.
if user click on no on the message , then page should redirect to login screen.

How to do this?

Thanks in advance
George n t