How about a Print button in the footer next to the Submit. That doesn't have to be coded in after the fact...
Huh, Huh, Please, Please
From a user standpoint when I fill out a form I usually assume that there is a potential that it works like the government, broken, so I always like to print out a copy of what I just ordered, subscribed to or whatever so I have a hard copy to refer to if the ever promised email never makes it to the inbox.
We're all here, because we're not all there..................
"Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us."
~Calvin