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Your question doesn’t give much details to help you.
But here are some links for javascript timers.
http://javascriptweblog.wordpress.com/2010/06/28/understanding-javascript-timers/
http://ejohn.org/blog/how-javascript-timers-work/
You may have a play/pause button. And trigger functions on pressing that button.
Try something using this information, when stuck in some problem, post what you tried, and people will help you.
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solved Javascript time spent playing [closed]