I am looking for info on what to use to allow a popup window to be closed using any type of browser so that it just closes as if the x close button was used.
By the way, I like your picture.
You will always get a prompt unless the window is a child window (created by another window and not opened by a url from the user.)
cckrocks is correct, although I've tried self.close() in a child window and haven't been asked to close. I just tested with IE5.5 . No Message box was to be seen at all..
Hope this helped. :)