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Onunload

By Stephen Chapman, About.com

Definition: The onunload event is used to define actions to be taken when the web page to which it is attached is unloaded (ie. when your visitor moves on to another page). This is not a reserved word so you can declare your own variable or function called onunload but if you do then you will not be able to use this event.
Examples:
<body onunload="myFunction(this)">
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