javascript/chrome onunload issue

[bluesource]

	var win = window.open(page,'window','width=270, height=155, left=300, top=200');
    
        alert('1');
        win.onunload = function() 
        {         
            alert('2');            
        }

Consider the above code:


In firefox, I see the new window popup, get a '1' alert, then close the popup window, then see the '2' alert.

In chrome, I see the new window popup, get a '1' alert, then additionally get the '2' alert immediately following the '1'.
When I close the chrome window I get no alerts.

What is the reason for this and how can I resolve this issue?