Just a little note...something else you could do is add:
<META HTTP-EQUIV="Refresh" content="180;URL=#">
to your header. It seems to work very well for me, the only problem that I have had, is that when I get people that take over 3 minutes to write a post it refreshes and they have to hit the back button (They can pick up where they left off)....but other than that it pretty much does the same thing. You can change the content="X to however many seconds you want. Just something that I thought was a lot quicker.
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