Dealing with multiple form submissions

Hey Everyone, Wondering what everyone does to prevent multiple form submissions? My form is simply getting emailed to my email, and it redirects to a success page when submitted... Would it be as simple as doing something with the cache control? Basically I'm trying to avoid someone submitting a form... Then hitting back, and submitting again, then hitting back.... I think you get the idea... What do you all do? Thanks! Jason Pruim lists@pruimphotography.com