Болванка.
test.php:

PHP код:
<?php
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");
if (isset($_POST["answer"])) {
$answer = $_POST["answer"];
if ($answer=="3")
include "success.inc";
else
include "error.inc";
}
else
include "form.inc";
?>
Пример form.inc:

PHP код:
<form action="test.php" method="post">
Question?
<br><input type="radio" name="answer" value="1" checked>Answer 1
<br><input type="radio" name="answer" value="2">Answer 2
<br><input type="radio" name="answer" value="3">Answer 3
<br><input type="radio" name="answer" value="4">Answer 4
<br><input type="radio" name="answer" value="5">Answer 5
<br><input type="submit">
</form>