Javascript Session Cookie constraints?

I was curious, if I set a javascript cookie to be a session only, is there any way to have it expire after X mins of inactivity on the website?
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Dave BaldwinFixer of ProblemsCommented:
Not by itself.  A session cookie expires when all windows of the browser are closed and the browser itself is closed.  You would have to create a timer in JavaScript to expire it although you may have to make it a regular cookie for that to work.

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