Capture the close event of popup window in JavaScript

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I need to perform some action before a popup window(using window.open ) closes.
window.open
Something like will be good:
var new_window = window.open('some url')
new_window.onBeforeUnload = function(){ my code}

var new_window = window.open('some url')
new_window.onBeforeUnload = function(){ my code}

How can I achieve that?


Tags: javascriptSource of the question:
https://stackoverflow.com/questions/7...

Question and source license information:
https://meta.stackexchange.com/help/l...
https://stackoverflow.com/