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onunload event for this. It's a little inconsistent, but it usually fires. this isn't my favorite functionality, but the client seems to want this
This might be a win/win situation for you! Most pop-up blockers stop this kind of thing. So you can put it there, but anyone who feels as you do and uses a blocker won't see it. And, presuming your client isn't in that group, he or she will see it and be happy.