Generic code to Detect Brower Close in IE: Javascript, JavaScript, IE 6

Generic code to Detect Brower Close in IE

Hi , I had a code that was detecting whether the user has attempted to close the browser or not .
If yes ,then there should be a message ,other wise not .
The code that was working fine ,is like

<html>
<head>
<title>Detecting browser close in IE</title>
<script type="text/javascript">
var message='Browser close attempt is detected';
function ConfirmClose()
{
      if (event.clientY < 0)
      {
            event.returnValue = message;
      }
}

</script>
</head>

<body onbeforeunload="ConfirmClose()" >
<h4>Close browser!</h4>
</body>
</html>

This works fine but with two exceptions that I have noticed so far.

1.If the user right-click on the title bar , an option to close the browser appears.Now if he clicks on that close option browser gets closed without any message .
2.If the browser is minimized and the user right-clicks on the minimized browser , an option to close the browser appears.
Now also if close option clicked browser gets closed without any message .

Both of the cases do occur as the condition mentioned in my code i.e.
"event.clientY < 0 " is violated .

What can be generic code to handle these two situations ?
One thing I have noticed that in case 1 and case 2
the event.srcElement is null .
Would adding that check will be a full proof check ?

Any suggestions ?
Regards,
Ayan

<html>
<head>
<title>Detecting browser close in IE</title>
<script type="text/javascript">
var message='Browser close attempt is detected';
function ConfirmClose()
{
	if (event.clientY < 0)
	{
		event.returnValue = message;
	}
}
 
</script>
</head>
 
 
<body onbeforeunload="ConfirmClose()" >
<h4>Close browser!</h4>
</body>
</html>

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Generic code to Detect Brower Close in IE

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