Stopwatch

Hi all.
i need to insert a stopwatch to a form. When someone start to type, fill the for the stopwatch start and when he finish it should stop or the person can press a button to stop the stopwatch. Is it possible? Anyone has an idea on how to do this?
i tried to insert some stopwatch but all i could find was old Flash version, not compatible with my actual work.
I am working with Flash 8, Actionscript 2.

Many thanks for your help!

Nadia