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Feedback form help with (captcha)

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I have a feedback form where the user has to enter a captcha images to send.

If the user doesn't fill out any text fields but does complete the captcha image correctly, a blank email is getting sent and I get this error message but if the user does complete the form correclty the email is sent.

[b]Warning:[/b] Cannot modify header information - headers already sent by (output started at /home/adrock/public_html/jack/includes/captcha.php:24) in [b]/home/adrock/public_html/jack/includes/captcha.php [/b] on line [b]51[/b]

I need some sort of vaildation where if there is any blank fields the form is shown and a message saying which field requires entry

The feedback form is displayed in index.php?page=contact

// *** The CAPTCHA comparison - http://frikk.tk ***

// *** We need to make sure theyre coming from a posted form -
// If not, quit now ***
die("You can only reach this page by posting from the html form");

// *** The text input will come in through the variable $_POST["captcha_input"],
// while the correct answer is stored in the cookie $_COOKIE["pass"] ***
if ($_POST["captcha_input"] == $_SESSION["pass"])

$myemail = "me@myemail.co.uk";
$ccx = "";

if(!$visitormail == "" && (!strstr($visitormail,"@") || !strstr($visitormail,".")))
echo "<h2>Use Back - Enter valid e-mail</h2>\n";
$badinput = "<h2>Feedback was NOT submitted</h2>\n";
if(empty($visitor) || empty($visitormail) || empty($notes )) {
echo "<h2>Use Back - fill in all fields</h2>\n";
echo $badinput;

$todayis = date("l, F j, Y, g:i a") ;

$subject = $attn;

$notes = stripcslashes($notes);

$message = " $todayis [EST] \n
Message: $notes \n
From: $visitor ($visitormail)\n
Additional Info : IP = $ip \n
Browser Info: $httpagent \n

$from = "From: $visitormail\r\n";

if (($ccopy == "ccyes") && ($visitormail != ""))
mail($visitormail, $subject, $message, $from);

if ($myemail != "")
mail($myemail, $subject, $message, $from);

if ($ccx != "")
mail($ccx, $subject, $message, $from);
header('Location: http://www.mysite.co.uk/jack/index.php?page=thankyou');
{header('Location: http://www.mysite.co.uk/jack/index.php?page=contact');

Anyone have any ideas how i can do this

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