PHP - Hello Need Help With Making A Captcha Form, Please Help

<form method="post" action="mail-e.php">
<p><input type="text" name="name" id="name" value="who are you?" size="25" /></p>
<p><input type="text" name="email" id="email" value="you@whatever.bla" size="25" /></p>
<p><input type="text" name="url" id="url" value="http://" size="25" /></p>
<p><textarea name="comments" id="comments" rows="1" cols="20">Go on, then. Tell me a story, wingy!</textarea></p>
<p><img src="http://echoing.org/captcha.php" alt="humanity check" /><br />
<input type="text" name="captcha" id="captcha" /> <br />
<p><input type="submit" name="submit" id="submit" value="sing to me" /> 
<input type="reset" name="reset" id="reset" value="out of key" /></p>
</form>

<?php
session_start();

//Encrypt the posted code field and then compare with the stored key

if(md5($_POST['captcha']) != $_SESSION['key'])
{
  die("Error: You must enter the code correctly");
}else{
  echo 'You entered the code correctly';
}
?>

<?php
if (!isset($_POST['submit'])) {
include('./header.php');
   echo "<h1>HEY!!! You just encountered an error!</h1>\n
      <p>You don't belong here. <strong>Because it's <em>wrong</em>.</strong> Go back and try again, please.</p>";
include('./footer.php');
   exit;
}

function cleanUp($data) {
   $data = strip_tags($data);
   $data = trim(htmlentities($data));
   return $data;
}

$name      = cleanUp($_POST['name']);
$email     = cleanUp($_POST['email']);
$url       = cleanUp($_POST['url']);
$comments  = cleanUp($_POST['comments']);

if ((empty($name)) || (empty($email)) || (empty($comments))) {
include('./header.php');
   echo "<h2>Input Error! Looks like you missed some stuff.</h2>\n
     <p><strong>Name</strong>, <strong>e-mail</strong> and <strong>comments</strong> are required fields. Please fill them in and try again:</p>";

   echo "<form action=\"mail-e.php\" method=\"post\"><p>";
   echo "<input type=\"text\" name=\"name\" id=\"name\" value=\"$name\" /> Name<br />";
   echo "<input type=\"text\" name=\"email\" id=\"email\" value=\"$email\" /> E-mail<br />";
   echo "<input type=\"text\" name=\"url\" id=\"url\" value=\"$url\" /> Site URL<br />";
   echo "<textarea name=\"comments\" id=\"comments\">$comments</textarea> Comments<br />";
   echo "<img src=\"http://echoing.org/captcha.php\" alt=\"humanity check\" style=\"margin-bottom: 2px;\" /><br />";
   echo "<input type=\"text\" name=\"captcha\" id=\"captcha\" /> <br />";
   echo "<input type=\"submit\" name=\"submit\" id=\"submit\" value=\"Send\" />";
   echo "</p></form>";
include('./footer.php');

   exit;
}

if (!ereg("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,6})$",$email)) {
include('./header.php');
echo "<h2>Input Error</h2>\n
<p>That e-mail address you entered - \"$email\" - is <em>not</em> a valid electronic address. Please edit it and send it in again, please:</p>";

   echo "<form action=\"mail-e.php\" method=\"post\"><p>";
   echo "<input type=\"text\" name=\"name\" id=\"name\" value=\"$name\" /> Name<br />";
   echo "<input type=\"text\" name=\"email\" id=\"email\" value=\"$email\" /> E-mail<br />";
   echo "<input type=\"text\" name=\"url\" id=\"url\" value=\"$url\" /> Site URL<br />";
   echo "<textarea name=\"comments\" id=\"comments\">$comments</textarea> Comments<br />";
   echo "<img src=\"captcha.php\" alt=\"humanity check\" style=\"margin-bottom: 2px;\" /><br />";
   echo "<input type=\"text\" name=\"captcha\" id=\"captcha\" /> <br />";
   echo "<input type=\"submit\" name=\"submit\" id=\"submit\" value=\"Send\" />";
   echo "</p></form>";
include('./footer.php');

   exit;
}

$email = preg_replace("([\r\n])", "", $email);

$find = "/(content-type|bcc:|cc:)/i";
if (preg_match($find, $name) || preg_match($find, $email) || preg_match($find, $url) || preg_match($find, $comments)) {
include('./header.php');
   echo "<h1>Error</h1>\n
      <p>No meta/header injections, please.</p>";
include('./footer.php');
   exit;
}

$recipient = "my email address is here";
$subject   = "paint me a wish on a velvet sky";

$message   = "Name: $name \n";
$message  .= "E-mail: $email \n";
$message  .= "URL: $url \n";
$message  .= "Comments: $comments";

$headers   = "From: a wish painted on the velvet sky \r\n";
$headers  .= "Reply-To: $email";

if (mail($recipient,$subject,$message,$headers)) {
include('./header.php');
   echo "<<p>WOO HOO! Your message was successfully sent to me! I'll read it as soon as I can. I may even respond! Thanks for using the form, fruitcake :)</p>";
include('./footer.php');
} else {
include('./header.php');
   echo "<p>Something went awry. Your message didn't go through. Want to take another crack at it? Please do, I'd love to hear from you!</p>";
include('./footer.php');
}
?>

<?php
//Start the session so we can store what the code actually is.
session_start();

//Now lets use md5 to generate a totally random string
$md5 = md5(microtime() * mktime());

/*
We dont need a 32 character long string so we trim it down to 5
*/
$string = substr($md5,0,5);

/*
Now for the GD stuff, for ease of use lets create
 the image from a background image.
*/

$captcha = imagecreatefromjpeg("http://echoing.org/captcha.jpg");

/*
Lets set the colours, the colour $line is used to generate lines.
 Using a blue misty colours. The colour codes are in RGB
*/

$black = imagecolorallocate($captcha, 0, 0, 0);
$line = imagecolorallocate($captcha,233,239,239);

/*
Now to make it a little bit harder for any bots to break, 
assuming they can break it so far. Lets add some lines
in (static lines) to attempt to make the bots life a little harder
*/
imageline($captcha,0,0,39,29,$line);
imageline($captcha,40,0,64,29,$line);

/*
Now for the all important writing of the randomly generated string to the image.
*/
imagestring($captcha, 5, 20, 10, $string, $black);

/*
Encrypt and store the key inside of a session
*/

$_SESSION['key'] = md5($string);

/*
Output the image
*/
header("Content-type: image/jpeg");
imagejpeg($captcha);
?> 

<?php
	

		//If the form is submitted:
		if(isset($_POST['submitted'])) {

		//load recaptcha file
		require_once('captcha/recaptchalib.php');

		//enter your recaptcha private key
		$privatekey = "6Ld5Df4SAAAAAKciqwDco8dfvBR15fGeFVXWcvCO";
			
			//check recaptcha fields
			$resp = recaptcha_check_answer ($privatekey,
										$_SERVER["REMOTE_ADDR"],
										$_POST["recaptcha_challenge_field"],
										$_POST["recaptcha_response_field"]);


			//Check to see if the invisible field has been filled in
			if(trim($_POST['checking']) !== '') {
				$blindError = true;
			} else {
				
				//Check to make sure that a contact name has been entered	
				$authorName = (filter_var($_POST['formAuthor'], FILTER_SANITIZE_STRING));
				if ($authorName == ""){
					$authorError = true;
					$hasError = true;
				}else{
					$formAuthor = $authorName;
				};
				
				
				//Check to make sure sure that a valid email address is submitted
				$authorEmail = (filter_var($_POST['formEmail'], FILTER_SANITIZE_EMAIL));
				if (!(filter_var($authorEmail, FILTER_VALIDATE_EMAIL))){
					$emailError = true;
					$hasError = true;
				} else{
					$formEmail = $authorEmail;
				};
					
				//Check to make sure the subject of the message has been entered
				$msgSubject = (filter_var($_POST['formSubject'], FILTER_SANITIZE_STRING));
				if ($msgSubject == ""){
					$subjectError = true;
					$hasError = true;
				}else{
					$formSubject = $msgSubject;
				};
				
				//Check to make sure content has been entered
				$msgContent = (filter_var($_POST['formContent'], FILTER_SANITIZE_STRING));
				if ($msgContent == ""){
					$commentError = true;
					$hasError = true;
				}else{
					$formContent = $msgContent;
				};
				
				// if all the fields have been entered correctly and there are no recaptcha errors build an email message
				if (($resp->is_valid) && (!isset($hasError))) {
					$emailTo = 'carlycyber@hotmail.co.uk'; // here you must enter the email address you want the email sent to
					$subject = 'A new message from: immigration solicitors Manchester' ;
					$body = "Name :formAuthor \n\nEmail: $formEmail \n\nTelephone :formSubject \n\nContent: $formContent  \n\n$formAuthor"; // This is the body of the email
						$headers = 'From: <'.$formEmail.'>' . "\r\n" . 'Reply-To: ' . $formEmail . "\r\n" . 'Return-Path: ' . $formEmail; // Email headers // Email headers
					
					//send email
					mail($emailTo, $subject, $body, $headers);
					
					// set a variable that confirms that an email has been sent
					$emailSent = true;
				}
				
				// if there are errors in captcha fields set an error variable
				if (!($resp->is_valid)){
					$captchaErrorMsg = true;
				}
			}
		} ?>
						
		<?php // if the page the variable "email sent" is set to true show confirmation instead of the form ?>
		<?php if(isset($emailSent) && $emailSent == true) { ?>
			
            
<?php 
$message = "Thank you. Your form has been submitted and a member of our team will contact you shortly.This website is developed for generating immigration enquiries in your area and it is not a law firm, your enquiries will be passed on to a solicitor.We confirm that this website does not belong to a law firm and we have no physical office in your county. Our solicitors are able to provide immigration services all over the UK because they provide a Virtual Service.Responses to your legal enquiries and the legal opinion given to you would be provided by a qualified UK Immigration Solicitor. If you decide to proceed with the solicitor, your matter will be dealt with under a Law firm regulated by the Solicitors Regulatory Authority.";

echo "<script type='text/javascript'>alert('$message');</script>";

/*echo "<script language='javascript'>
window.location('http://www.immigrationsolicitorsmanchesteruk.co.uk/thankyou.php')
</script>";*/

?>
<p>Thank you. Your form has been submitted and a member of our team will contact you shortly.This website is developed for generating immigration enquiries in your area and it is not a law firm, your enquiries will be passed on to a solicitor.We confirm that this website does not belong to a law firm and we have no physical office in your county. </p>

		<?php } else { ?>
		<?php // if there are errors in the form show a message ?>
			<?php if(isset($hasError) || isset($blindError)) { ?>
				<p><strong>Im sorry. There was an error submitting the form. Please check all the marked fields and try again.</strong></p>
			<?php } ?>
			<?php // if there are recaptcha errors show a message ?>
			<?php if ($captchaErrorMsg){ ?>	
				<p><strong>The recaptcha was not entered correctly. Please try again.</strong></p>
			<?php } ?>
			<?php 
			// here, you set what the recaptcha module should look like
			// possible options: red, white, blackglass and clean
			// more infor on customisation can be found he  http://code.google.com/intl/pl-PL/apis/recaptcha/docs/customization.html
			?>
			<script type="text/javascript">
				var RecaptchaOptions = {
					theme : 'blackglass'
				};
			</script>
			<?php
			// this is where the form starts
			// action attribute should contain url of the page with this form
			// more on that you can read he  http://www.w3schools.com/TAGS/att_form_action.asp
			?>
			<form id="contactForm" action="" method="post">
				
					<p>	
						
			  <strong>Full Name</strong><br/>	<input class="requiredField <?php if($authorError) { echo 'formError'; } ?>" type="text" name="formAuthor" id="formAuthor" value="<?php if(isset($_POST['formAuthor']))  echo $_POST['formAuthor'];?>"size="25" /></p>
					<p>
					<strong>Email </strong><br/>
						<input class="requiredField <?php if($emailError) { echo 'formError'; } ?>" type="text" name="formEmail" id="formEmail" value="<?php if(isset($_POST['formEmail']))  echo $_POST['formEmail'];?>" size="25" />
					</p>
                    
                    <p>
							<strong>Telephone </strong><br/>	
						<input class="requiredField <?php if($subjectError) { echo 'formError'; } ?>" type="text" name="formSubject" id="formSubject" value="<?php if(isset($_POST['formSubject']))  echo $_POST['formSubject'];?>" size="25" />
					</p>
                    <p>
					
						<strong>Please give us some information about your enquiry</strong><br/>
			  <textarea class="requiredField <?php if($commentError) { echo 'formError'; } ?>" id="formContent" name="formContent" cols="25" rows="5"><?php if(isset($_POST['formContent'])) { if(function_exists('stripslashes')) { echo stripslashes($_POST['formContent']); } else { echo $_POST['formContent']; } } ?></textarea></p>
					<?php 
					// this field is visible only to robots and screenreaders
					// if it is filled in it means that a human hasn't submitted this form thus it will be rejected
					?>
					<div id="screenReader">
						<label for="checking">
							If you want to submit this form, do not enter anything in this field
						</label>
						<input type="text" name="checking" id="checking" value="<?php if(isset($_POST['checking']))  echo $_POST['checking'];?>" />
					</div>
				</div>
				<?php
					// load recaptcha file
					require_once('captcha/recaptchalib.php');
					// enter your public key
					$publickey = "6Ld5Df4SAAAAANFKozja9bUlDziJ92c31DDt1j6k";
					// display recaptcha test fields
					echo recaptcha_get_html($publickey);
				?>
				<input type="hidden" name="submitted" id="submitted" value="true" />
				<?php // submit button ?>
				<input type="submit" value="Send Message" tabindex="5" id="submit" name="submit">
			</form>
		<?php } // yay! that's all folks! ?>