<html>
<head>
<script type="text/javascript">
function ifClosed()
{ document.write("'myWindow' has been closed!") }
function ifNotClosed()
{ document.write("'myWindow' has not been closed!") }
function checkWin()
{ if (myWindow.closed)
ifClosed()
else
ifNotClosed()
}
</script>
</head>
<body>
<script type="text/javascript">
myWindow=window.open('','','width=200,height=100')myWindow.document.write("This is 'myWindow'")</script>
<input type="button" value="Has 'myWindow' been closed?" onclick="checkWin()" />
</body>
</html>