How to detect a close of a browser using JavaScript or jQuery [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

Handle Browser close in JavaScript?

How to detect a close of a browser using JavaScript or jQuery, I got the window.onbeforeUnload and $(window开发者_开发知识库).unload() of JavaScript and jQuery respectively, but that even gets called on leaving of page,and etc... but I need only and only the close event, nothing else and only that.

---

Sorry, but this is impossible.

---

$(window).unload( 
function () { alert("You Are closing window"); }
);

is that what you mean