Open a window when "X" is clicked

Hello, I would like to be able to launch a window (any window, such as launching [login to view URL]) when the user clicks on the "X" button (beside the minimize button). The catch is that I do not want to have this window launched if the window is clicked by any kind of link, such as from a form button, that closes the window with Javascript (e.g. using [login to view URL]()). I'm not sure if this is done with JavaScript or with AJAX. Can you let me know which you'll be using? The script must be compatible with ie7. Thanks,