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<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>