<form onSubmit="return checkForm()" name="form" class="form" method="post" action="this_page.php">
If I take out the "onSubmit" code, the script works as it always did. So does that mean that you cannot have an "onSubmit" as well as an "Action" in the form header?
Then the PHP code is run, and of course, and what happens depends on what the user has input.
At the moment, as I have said, when I click on the Continue button absolutely nothing happens. The form just stays as it was.