Fire a Function on window close

Question

Possible Duplicate:
javascript detect browser close tab/close browser

I have a java script countdown timer on my page and i want to trigger an alert message if user tries to close the window or a tab.

Answer 1

https://developer.mozilla.org/en-US/docs/DOM/window.onbeforeunload

Update: this answer was provided by Adnan in comment few mins before me :)

Answer 2

Use this event

window.onbeforeunload = function() {
   //your message goes here
}

By using jQuery

$(window).unbind("beforeunload");
$(window).bind("beforeunload", function (e) {
   //do your work here
});