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מתוך ה-MSDN
יעבוד רק ב-IE:

Q: Ikram wants to know if you can detect when the user closes the browser from script.

A: The short answer is no, but since we've got a little extra room, there is a way to make a very educated guess. If you use the following as your BODY onUnload event handler, you'll catch it in virtually all cases:

function body_onUnload()
{
if (window.event.clientX < 0)
{
alert("The browser is closing…");
}
else
{
alert("The user is refreshing or navigating away…");
}
}

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