TalkPHP - getting error when put recapatcha in to script! need help

I have a script input that allows you to add to the site guest book, which connects and sends data to the MYSQL data-base. The data base and everything else works fine, if i dont add the reCapatch script everything works perfectly... but then when i add reCapatch i pull out a 500 error, and for the life of me cant figure out why. Could you guys take a look and see if you can spot the problem! i am guessing its not reCapatcha causing the problem but something in my custom code for the data thanks

here is my script:

PHP Code:


		
			
<?php

require_once('location/recaptchalib.php');

  $privatekey = "my private key";

  $resp = recaptcha_check_answer ($privatekey,

                                $_SERVER["REMOTE_ADDR"],

                                $_POST["recaptcha_challenge_field"],

                                $_POST["recaptcha_response_field"]);



  if (!$resp->is_valid) {

    // What happens when the CAPTCHA was entered incorrectly

    die ("The reCAPTCHA wasn't entered correctly. Go back and try it again." .

         "(reCAPTCHA said: " . $resp->error . ")");

  } else {



    // Your code here to handle a successful verification

$dbservertype='mysql';

$servername='sname';

// username and password to log onto db server

$dbusername='uname';

$dbpassword='dbpass';

// name of database

$dbname='dbname';



////////////////////////////////////////

////// DONOT EDIT BELOW  /////////

///////////////////////////////////////

connecttodb($servername,$dbname,$dbusername,$dbpassword);

function connecttodb($servername,$dbname,$dbuser,$dbpassword){

global $link;

$link=mysql_connect ("$servername","$dbuser","$dbpassword");

if(!$link){die("Could not connect to MySQL");}

mysql_select_db("$dbname",$link) or die ("could not open db".mysql_error());

}





$email=$_POST['email'];

$name=$_POST['name'];

$country=$_POST['country'];

$dtl=$_POST['dtl'];





$status = "OK"; // setting the flag for form validation

$msg="";        // error message string is blank

// now let us check email address

if (!stristr($email,"@") OR !stristr($email,".")) {

$msg="<center>Your email address is not correct</center><BR>";

$status="NOT OK";

}

// Now let us check if name is entered or not 

if(strlen($name) < 2 ){  // if name is less than two char length

$msg .="<center>Please enter your name</center><BR>";

$status="NOT OK";

}

if($status<>"OK"){ // if form validation is not passed

echo "<BR><BR>";

echo $msg. "<br><center><input type='button' value='Retry' onClick='history.go(-1)'></center><br><br><br>";

}else{

$tm=time(); // reading the time of entry

// adding data to mysql database

//first thing is to escape single quotes!

$dtl = str_replace("'","\'",$dtl);

//now process

$rt=mysql_query("insert into guest_book(name,email,country,tm,dtl) values('$name','$email','$country','$tm','$dtl')");

echo mysql_error();

echo "Thank you for your comment! You will automaticly be redirected...";

//send e mail to self with the users e mail address for a thank you message!



  }

header('Refresh: 5; URL=../');

  

?>