Apache Error in PHP Form Help: This must e simple for a PHP man, but not for me

I am very new to PHP and have a problem with a conatct form.

I have drawn up my form and it sends the details through, but instead of going to the successful page called ackofdetails.php, I get this message


Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, www.123-support.co.uk and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Apache Server at www.c5d.co.uk Port 80

My contact form seems OK

This is it. Underneath is the page which contains the necessary coding to send the info

<!DOCTYPE html>
<html lang="en"><head> <meta charset="utf-8">
    <title> Change of Address| Welcome To The Ashton Under Lyne Golf Club Website</title>

    <link rel="stylesheet" href="http://www.c5d.co.uk/clubstyle.css" type="text/css" media="screen">
    <link rel="stylesheet" href="http://www.c5d.co.uk/MenuMatic.css" type="text/css" media="screen">

    <script src="http://www.c5d.co.uk/mootools-1.2.5-core-yc.js" type="text/javascript"></script>
    <script src="http://www.c5d.co.uk/MenuMatic_0.68.3.js" type="text/javascript"></script>
</head><?php
$date = date(“format”, $timestamp);
?>
<body>

<script type="text/javascript">
    window.addEvent('domready', function() {
        var myMenu = new MenuMatic();
    });
</script>

<div id="wrapper">
    <div id="container" class="container">

<!-- BEGIN menu.php INCLUDE -->
<?php include $_SERVER["DOCUMENT_ROOT"] . "/includes/menu.php"; ?>
<!-- END menu.php INCLUDE -->
        <div>
            <div class="span-24" id="contentwrap" style="background:#E0E0E0;">
                <div class="span-13">
                    <div id="content">
                        <div style="position:relative;">
                            <div class="postwrap">
                                <div class="post" id="post-222" style="width:760px;">
                                    <div class="entry" style="position:relative;">
                                        <div id="ai1ec-container" class="ai1ec-container thenly">


<ul class="opendays">
 <li>
 <p><strong>Change of Peronal Details</strong></p>
 </li>
 </ul>




<form method="POST" name="contactform" action="changeofaddress.php">
<p>
<label for='name'>Your Name:</label> <br>
<input type="text" name="name">
</p>
<p>
<label for='email'>Email Address:</label> <br>
<input type="text" name="email"> <br>
</p>
<p>
<label for='message'>Message:</label> <br>
<textarea name="message"></textarea>
</p>
<input type="submit" value="Submit"><br>
</form>

<script language="JavaScript">
// Code for validating the form
// Visit http://www.javascript-coder.com/html...lidation.phtml
// for details
var frmvalidator = new Validator("contactform");
frmvalidator.addValidation("name","req","Please provide your name");
frmvalidator.addValidation("email","req","Please provide your email");
frmvalidator.addValidation("email","email","Please enter a valid email address");
</script>
            </div>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="span-11 last">
                    <div class="span-7">
                        <div class="sidebar left-sidebar"></div>
                    </div>
                    <div class="span-4 last">

                        <div class="sidebaradbox125">
						    <a href="http://www.brsgolf.com/ashtonunderlyne/visitor_availability_month.php"><img class="whatson" src="http://www.c5d.co.uk/whatson.png" alt="book a tee"/></a>
                            <a href="http://www.brsgolf.com/ashtonunderlyne/opens_home.php" target="_blank"><img class="ad125" src="http://www.c5d.co.uk/brsgolf.jpg" alt="Book An Open" /></a>
                            <a href="http://www.howdidido.co.uk" target="_blank"><img class="ad125" src="http://www.c5d.co.uk/howdidido.jpg" alt="How Did I Do" /></a>
                            <a href="http://www.c5d.co.uk/teetimetwo.php"><img src="http://www.c5d.co.uk/tee-time.png" alt="book a tee"/></a>
                            <a href="http://www.c5d.co.uk/hurstweathertwo.php"><img class="ad125" src="http://www.c5d.co.uk/hurstweather.jpg" alt="Weather Widget" /></a>
                           <a href="http://www.c5d.co.uk/teetimetwo.php"></a>
							</div>
							 <div class="sidebar right-sidebar"></div>
                        <div class="socialboxes">
						    <a href="http://www.facebook.com/home.php?sk=group_152294981498083&amp;ap=1" target="_blank"><img class="ad125" src="http://www.c5d.co.uk/facebook.png" alt="Facebook" height="25" width="130" />FACEBOOK</a>
                        </div>
                        <div class="socialboxes">
                            <a href="http://www.c5d.co.uk/notwittertwo.php"><img class="ad125" src="http://www.c5d.co.uk/twitter.png" alt="Follow Us" title="Follow Us" style="vertical-align:middle; margin-right:5px;" /></a>
                            <a href="http://www.c5d.co.uk/notwittertwo.php">Follow Us</a></div>
                    </div>
                </div>
            </div>

        <div class="span-24">
            <div id="footer" style="padding:6px; height:15px;">
                <span style="float:left;">Copyright © Antony Lambert</span><?php echo date('l j F Y - H:ia'); ?>
                    <span style="float:right;"><a href="http://www.c5d.co.uk/hurstpages.php" target="_blank">The Hurst Pages</a> by <a href="http://www.c5d.co.uk" target="_blank">Antony Lambert of C5D</a></span>
                </div>
            </div>
        </div>
    </div>
</div>
</body>
</html>

This is the change of adress page where I guess the mechanics are done

<?php
$errors = '';
 $myemail = 'antonylambert@c5d.co.uk';//<-----Put Your email address here.
 if(empty($_POST['name']) ||
empty($_POST['email']) ||
empty($_POST['message']))
 {
 $errors .= "\
 Error: all fields are required";
 }

$name = $_POST['name'];
$email_address = $_POST['email'];
$message = $_POST['message'];

if (!preg_match(
 "/^[_a-z0-9-]+(\\.[_a-z0-9-]+)*@[a-z0-9-]+(\\.[a-z0-9-]+)*(\\.[a-z]{2,3})$/i",
$email_address))
 {
 $errors .= "\
 Error: Invalid email address";
 }

if( empty($errors))
 {
 $to = $myemail;
$email_subject = "Contact form submission: $name";
 $email_body = "You have received a new message. ".
 " Here are the details:\
 Name: $name \
 Email: $email_address \
 Message \
 $message";

$headers = "From: $myemail\
";
$headers .= "Reply-To: $email_address";

 mail($to,$email_subject,$email_body,$headers);
//redirect to the 'ackofdetails' page
header('ackofdetails.php');
exit();
 }


if ($errors) {
echo '<!DOCTYPE html>
<html lang="en"><head> <meta charset="utf-8">
    <title>Oops! There was an error</title>

    <link rel="stylesheet" href="http://www.c5d.co.uk/clubstyle.css" type="text/css" media="screen">
    <link rel="stylesheet" href="http://www.c5d.co.uk/MenuMatic.css" type="text/css" media="screen">

    <script src="http://www.c5d.co.uk/mootools-1.2.5-core-yc.js" type="text/javascript"></script>
    <script src="http://www.c5d.co.uk/MenuMatic_0.68.3.js" type="text/javascript"></script>
</head>
<body>

<script type="text/javascript">
    window.addEvent("domready", function() {
        var myMenu = new MenuMatic();
    });
</script>

<div id="wrapper">
    <div id="container" class="container">

<!-- BEGIN menu.php INCLUDE -->
include $_SERVER["DOCUMENT_ROOT"] . "/includes/menu.php";
<!-- END menu.php INCLUDE -->
        <div>
            <div class="span-24" id="contentwrap" style="background:#E0E0E0;">
                <div class="span-13">
                    <div id="content">
                        <div style="position:relative;">
                            <div class="postwrap">
                                <div class="post" id="post-222" style="width:760px;">
                                    <div class="entry" style="position:relative;">
                                        <div id="ai1ec-container" class="ai1ec-container thenly">
                                         <h1>Sorry, there was an error!</h1>
                                          <p>Please note the errors below:</p>
                                          <ul style="color: red;">';

echo nl2br($errors);
echo '</div>
                                    </div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="span-11 last">
                    <div class="span-7">
                        <div class="sidebar left-sidebar"></div>
                    </div>
                    <div class="span-4 last">

                        <div class="sidebaradbox125">
                            <a href="http://www.brsgolf.com/ashtonunderlyne/visitor_availability_month.php"><img class="whatson" src="http://www.c5d.co.uk/whatson.png" alt="book a tee"/></a>
                            <a href="http://www.brsgolf.com/ashtonunderlyne/opens_home.php" target="_blank"><img class="ad125" src="http://www.c5d.co.uk/brsgolf.jpg" alt="Book An Open" /></a>
                            <a href="http://www.howdidido.co.uk" target="_blank"><img class="ad125" src="http://www.c5d.co.uk/howdidido.jpg" alt="How Did I Do" /></a>
                            <a href="http://www.c5d.co.uk/teetime.php"><img src="http://www.c5d.co.uk/tee-time.png" alt="book a tee"/></a>
                            <a href="http://www.c5d.co.uk/hurstweather.php"><img class="ad125" src="http://www.c5d.co.uk/hurstweather.jpg" alt="Weather Widget" /></a>
                           <a href="http://www.c5d.co.uk/teetime.php"></a>
                            </div>
                             <div class="sidebar right-sidebar"></div>
                        <div class="socialboxes">
                            <a href="http://www.facebook.com/home.php?sk=group_152294981498083&amp;ap=1" target="_blank"><img class="ad125" src="http://www.c5d.co.uk/facebook.png" alt="Facebook" height="25" width="130" />FACEBOOK</a>
                        </div>
                        <div class="socialboxes">
                            <a href="http://www.c5d.co.uk/notwitter.php"><img class="ad125" src="http://www.c5d.co.uk/twitter.png" alt="Follow Us" title="Follow Us" style="vertical-align:middle; margin-right:5px;" /></a>
                            <a href="http://www.c5d.co.uk/notwitter.php">Follow Us</a></div>
                    </div>
                </div>
            </div>

        <div class="span-24">
            <div id="footer" style="padding:6px; height:15px;">
                <span style="float:left;">Copyright © Antony Lambert</span>'; echo date('l j F Y - H:ia'); echo '<span style="float:right;"><a href="http://www.c5d.co.uk/hurstpages.php" target="_blank">The Hurst Pages</a> by <a href="http://www.c5d.co.uk" target="_blank">Antony Lambert of C5D</a></span>
                </div>
            </div>
        </div>
    </div>
</div>
</body>
</html>';}

What am I doing wrong

Antony