email/contact form issues

<?php
// Set email variables
$email_to = '[email protected]';
$email_subject = 'Form submission';

// Set required fields
$required_fields = array('fullname','email','comment');

// set error messages
$error_messages = array(
'fullname' => 'Please enter a Name to proceed.',
'email' => 'Please enter a valid Email Address to continue.',
'comment' => 'Please enter your Message to continue.'
);

// Set form status
$form_complete = FALSE;

// configure validation array
$validation = array();

// check form submittal
if(!empty($_POST)) {
// Sanitise POST array
foreach($_POST as $key => $value) $_POST[$key] = remove_email_injection(trim($value));

// Loop into required fields and make sure they match our needs
foreach($required_fields as $field) {
// the field has been submitted?
if(!array_key_exists($field, $_POST)) array_push($validation, $field);

// check there is information in the field?
if($_POST[$field] == '') array_push($validation, $field);

// validate the email address supplied
if($field == 'email') if(!validate_email_address($_POST[$field])) array_push($validation, $field);
}

// basic validation result
if(count($validation) == 0) {
// Prepare our content string
$email_content = 'New Website Comment: ' . "\n\n";

// simple email content
foreach($_POST as $key => $value) {
if($key != 'submit') $email_content .= $key . ': ' . $value . "\n";
}

// if validation passed ok then send the email
mail($email_to, $email_subject, $email_content);

// Update form switch
$form_complete = TRUE;
}
}

function validate_email_address($email = FALSE) {
return (preg_match('/^[^@\s]+@([-a-z0-9]+\.)+[a-z]{2,}$/i', $email))? TRUE : FALSE;
}

function remove_email_injection($field = FALSE) {
return (str_ireplace(array("\r", "\n", "%0a", "%0d", "Content-Type:", "bcc:","to:","cc:"), '', $field));
}

?>

    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/mootools/1.3.0/mootools-yui-compressed.js"></script>
    <script type="text/javascript" src="contact/validation/validation.js"></script>
	
	<script type="text/javascript">
var nameError = '<?php echo $error_messages['fullname']; ?>';
		var emailError = '<?php echo $error_messages['email']; ?>';
		var commentError = '<?php echo $error_messages['comment']; ?>';
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
    </script>

    <?php if($form_complete === FALSE): ?>
    <form action="contact.php" method="post" id="comments_form">
    
	<div class="row">
			<div class="label">Your name :</div> <!-- end .label -->
			<div class="input">
			<input type="text" id="fullname" class="detail" name="fullname" value="<?php echo isset($_POST['fullname'])? $_POST['fullname'] : ''; ?>" /><?php if(in_array('fullname', $validation)): ?><span class="error"><?php echo $error_messages['fullname']; ?></span><?php endif; ?>
			</div><!-- end .input -->
			<div class="context">e.g. John Smith or Jane Doe</div><!-- end .context -->
	</div> <!-- end .row -->

	<div class="row">
			<div class="label">Your email adress :</div> <!-- end .label -->
			<div class="input">
			<input type="text" id="email" class="detail" name="email" value="

<?php echo isset($_POST['email'])? $_POST['email'] : ''; ?>" /><?php if(in_array('email', $validation)): ?><span class="error"><?php echo $error_messages['email']; ?></span><?php endif; ?>
			</div><!-- end .input -->
			<div class="context">We will not share your email with anyone or spam you with messages either</div><!-- end .context -->
	</div> <!-- end .row -->

	<div class="row">
			<div class="label">Your message :</div> <!-- end .label -->
			<div class="input">
			<textarea id="comment" name="comment" class="mess"><?php echo isset($_POST['comment'])? $_POST['comment'] : ''; ?></textarea><?php if(in_array('comment', $validation)): ?><span class="error"><?php echo $error_messages['comment']; ?></span><?php endif; ?>
			</div><!-- end .input -->
	</div> <!-- end .row -->

		<div class="submit">
			<input type="submit" id="submit" name="submit" value="Send Message" />
		</div> <!-- end .submit -->
        </form>
        
        <?php else: ?>
<p style="margin-left:10px; margin-top:30px; margin-bottom:0px; font-size:18px;">Thank you for your message. We appreciate your feedback!</p>
<script type="text/javascript">
setTimeout('ourRedirect()', 4000)
function ourRedirect() {
	location.href='Index.html'
}
</script>
<?php endif; ?>