The action of your form will point to the process page for your email:
<form action="Email_Process.php" method="post">
Just call your processing page "Email_Process.php" for this exercise.
In your radio buttons, you have name="naughtynice" with a value of 1 and 2.
Before the section where it processes the accual mailing, place the fallowing:
if ($naughtynice == 1) { include("Naughty_Template.php"); }
else { include("Nice_Template.php"); }
What this does is if the radio button is nice, it includes the exterior file (template) of Nice_Template.php or the other.
In those templates, you will place some place your variables:
$firstname
$lastname
$wishlist
In your mail() function, change from:
$success=mail("santa@holidayletters.org", "Letter To Santa", $message, $mailheaders);
to
$success = @mail("santa@holidayletters.org", "Letter To Santa", $message, $mailheaders);
With the error message:
Not Found
The requested URL /Response_Page.php was not found on this server.
That is coming from the header() action of:
header("Location: Response_Page.php");
for the redirecting the user to a page to inform them that the email has been sent. Just create a page called Response_Page.php.