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How to override the window.close() event

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When I close the browser window,I want to confirm the does the user really wants to close the browser window by calling the window.confirm() method. And when cancel button is pressed I want that the browser window does not close. I am calling window.confirm method when the onunload method is called. But this happens after the browser window gets closed so how do I handle this . Suggest some way.
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should be something like this...you can also trigger onbeforeunload in IE. Closing with the little "x" may pose another situation...
<script language="javascript">
function makeSure(){
if(confirm("are you sure you want to close?")){
<input type="button" onclick="makeSure();" value="Close Window">
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unfortunately, if the user closes the browser with something other than that button (like clicking the little 'x' in the application window) you're out of luck. The onunload event will fire, but I don't think there's anything you can do can prevent the browser from closing . . .
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