Okay, hopefully this won't be overkill, but I'm going to try to give more than might be needed. To help give full context, I'm writing these in Notepad++ and when I want to test them I'm selecting Run>Launch in Firefox. Then filling out the form and clicking the submit button. The result is simply a page in Firefox that displays the script again.
And for what its worth, my OS is Windows XP SP3
HTML page
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"[
www.w3.org];
<html xmlns="[
www.w3.org]; xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Aliens Abducted Me - Report an Abduction</title>
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body>
<h2>Aliens Abducted Me - Report an Abduction</h2>
<p>Share your story of alien abduction:</p>
<form method="post" action="report.php">
<label for="firstname">First name:</label>
<input type="text" id="firstname" name="firstname" /><br />
<label for="lastname">Last name:</label>
<input type="text" id="lastname" name="lastname" /><br />
<label for="email">What is your email address?</label>
<input type="text" id="email" name="email" /><br />
<label for="whenithappened">When did it happen?</label>
<input type="text" id="whenithappened" name="whenithappened" /><br />
<label for="howlong">How long were you gone?</label>
<input type="text" id="howlong" name="howlong" /><br />
<label for="howmany">How many did you see?</label>
<input type="text" id="howmany" name="howmany" /><br />
<label for="aliendescription">Describe them:</label>
<input type="text" id="aliendescription" name="aliendescription" size="32" /><br />
<label for="whattheydid">What did they do to you?</label>
<input type="text" id="whattheydid" name="whattheydid" size="32" /><br />
<label for="fangspotted">Have you seen my dog Fang?</label>
Yes <input id="fangspotted" name="fangspotted" type="radio" value="yes" />
No <input id="fangspotted" name="fangspotted" type="radio" value="no" /><br />
<img src="fang.jpg" width="100" height="175"
alt="My abducted dog Fang." /><br />
<label for="other">Anything else you want to add?</label>
<textarea id="other" name="other"></textarea><br />
<input type="submit" value="Report Abduction" name="submit" />
</form>
</body>
</html>
PHP script
<html>
<head>
<title>Aliens Abducted Me - Report an Abduction</title>
</head>
<body>
<h2>Aliens Abducted Me - Report an Abduction</h2>
<?php
$name = $_POST ['firstname']. ' '. $_POST['lastname'];
$when_it_happened = $_POST ['whenithappened'];
$how_long = $_POST ['howlong'];
$how_many = $_POST ['howmany'];
$alien_description = $_POST ['aliendescription'];
$what_they_did = $_POST ['whattheydid'];
$fang_spotted = $_POST ['fangspotted'];
$email = $_POST ['email'];
$other = $_POST ['other'];
echo 'Thanks for submitting the form.<br />';
echo 'You were abducted ' . $when_it_happened;
echo ' and were gone for ' . $how_long . '<br />';
echo 'There were ' . $how_many . '<br />';
echo 'Describe them: ' . $alien_description . '<br />';
echo 'The things they did to you included:' . $what_they_did . '<br />';
echo 'Was Fang there? ' . $fang_spotted . '<br />';
echo 'Other comments: ' . $other . '<br />';
echo 'Your email address is ' . $email;
?>
</body>
</html>