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Form with CAPTCHA


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Hi guys


I found a tutorial on webcheatsheet.com, to create a CAPTCHA, and have got the following code for the form


form id="frmCaptcha" name="frmCaptcha">
  <td><label for="name">Name</label></td>
  <td><input name="name" type="text" maxlength="20" size="32"/></td></tr>
  <td><label for="email">Email Address</label></td>
  <td><input name="email" type="text" maxlength="60" size="32"/></td></tr>
  <td valign="top"><label for="question">Question</label></td>
  <td class="textarea"><textarea name="question" cols="25" rows="10"></textarea></td></tr>
    <td align="left">
      <label for="captcha">Security</label>
      <input id="txtCaptcha" type="text" name="txtCaptcha" value="" maxlength="10" size="32" />
      <img id="imgCaptcha" src="create_image.php" />
    <td> </td>
      <input id="btnCaptcha" type="button" value="Captcha Test" name="btnCaptcha" 
          onclick="getParam(document.frmCaptcha)" />

<div id="result"> </div>



The following is the javascript for when the form is submitted


/Called every time when form is perfomed
function getParam(theForm) {
//Set the URL
var url = 'captcha.php';
up the parameters of our AJAX call
var postStr = theForm.txtCaptcha.name + "=" + encodeURIComponent( theForm.txtCaptcha.value )+
"&" + theForm.name.name + "=" + encodeURIComponent( theForm.name.value ) +
"&" + theForm.email.name + "=" + encodeURIComponent( theForm.email.value ) +
"&" + theForm.question.name + "=" + encodeURIComponent(theForm.question.value);


and the process captcha.php referenced in the javascript


This is the back-end PHP file for the How to Create CAPTCHA Protection using PHP and AJAX Tutorial

You may use this code in your own projects as long as this 
copyright is left in place.  All code is provided AS-IS.
This code is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of

For the rest of the code visit http://www.WebCheatSheet.com

Copyright 2006 WebCheatSheet.com	

//Continue the session

//Make sure that the input come from a posted form. Otherwise quit immediately
die("You can only reach this page by posting from the html form");

//Check if the securidy code and the session value are not blank 
//and if the input text matches the stored text
if ( ($_REQUEST["txtCaptcha"] == $_SESSION["security_code"]) && 
    (!empty($_REQUEST["txtCaptcha"]) && !empty($_SESSION["security_code"])) ) {
  $name = $_REQUEST['name'];
  $email = $_REQUEST['email'];
  $question = $_REQUEST['question'];

// Validation
if(2 < strlen($name) && 2 < strlen($email) && 2 < strlen($question))

$email_message = <<< EMAIL
A message was received from $name.

Name: $name



$headers = "from:$email\r\n"; //Set from address

if(mail('mark@bravo14.co.uk','Contact from projectrenovations.co.uk', $email_message, $headers)) //Change email address accordingly
	echo "Thank you $name, your email has been delivered, we will contact you shortly.";	
	echo "Sorry $name, we had a problem sending the email.";

  echo "You did not fill in the form properly. Please use the browser's 'back' button and update the form.";	
} else {
  echo "You have entered the wrong security code, try again!";


however when I submit the form, it doesn't do anything, any ideas?

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