On moving site to new Go Daddy server the above code change is now back to an incomplete Checkout page.
I tossed WebAssist generated code back into the confirm.php page, and gets me back to a complete form allowing one to complete the transaction, but now won't complete the transaction passing information to Auth.net.
The confirm page now on the site has the altered code from above, so incomplete Checkout page is what is now occurring.
This newer Go Daddy server is an odd beast. See private message with login.