How to implement stopwatch in asp.net 2.0 page

I want a stop watch with a start button and a stop button in my asp.net 2.0 page. How to implement this?

I would also like a timer to calcul开发者_C百科ate how much time user is viewing the page so that I can add this time in my database.

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You don't tell us much. Here are a couple....

JQuery Stopwatch Plugin

Another JQuery stopwatch plugin