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My friend Jeff over at Big Trapeze has posted a great code snippet to prevent users from accidentally double submitting forms or refreshing the page and getting an annoying alert box.

Alert box shown when you try to refresh a page that was posted to.

Lately, while developing sites, I’ve started to deal with a lot of form submissions, and I’m finding that it takes extra steps to prevent people from accidentally submitting a form twice. Double-posting (hitting the Submit button more than once, or refreshing a page where data has been processed) can lead to all sorts of bad problems. - Big Trapeze

Check it out! Big Trapeze