Current code

<?php
get_header();
registerNow();
get_sidebar();
echo "</div>";
get_footer();

// -- Begin changes (1 of 3) for the Are You A Human PlayThru CAPTCHA alternative.
// IMPORTANT:
// In order for the PlayThru code to work correctly...
//   - all the files from the ayah_php_bundle zipe file must be in the same folder as
//      this script file.
//   - the ayah_config.php file must contain your correct publisher_key and scoring key.
require_once("ayah.php");
$ayah = new AYAH();


function registerNow()
{
        global $wpdb,$table_prefix,$wp_version,$userdata,$current_user, $user_ID,$post,$wp_rewrite,$g_content, $ayah;
        get_currentuserinfo();
        ob_start();

        require_once(ABSPATH."/wp-includes/registration.php");
        echo "<div id='left'>";

        $errors = array();
        nocache_headers();
        $user_login = '';
        $user_pass = '';
        $confirm_pass = '';
        $using_cookie = FALSE;
        $m_siteurl = get_option('home');
        $m_errorHead =  '<div>';
        $m_errorHead .= '<h2>Error</h2><br />';
        $m_errorHead .= "<hr><br />";
        $m_errorTail = '</div>';
        $m_srReadSuccessHead =  '<div>';
        $m_srReadSuccessHead .= '<h2>Signup For Your Account:</h2><br />';
        $m_srReadSuccessTail = '</div>';

        //$m_registerURL1 = get_option('land_signup');
        $m_registerURL = get_option('home')."/?s=Register";
        $m_stReadErrorString = "<BR /> <BR />Please click <a href='".$m_registerURL."'> Here </a> to retry,thanks.<br /><br />";

        if (isset($_POST['landRegisterUser']))
        {
                $user_login = $wpdb->escape($_POST['landRegisterUser']);
                if (empty($user_login))
                {
                        die($m_errorHead."Please enter a username".$m_stReadErrorString.$m_errorTail);
                }
                $user_login = sanitize_user( $user_login );
                $user_email = $wpdb->escape($_POST['landRegisterEmail']);
                if (empty($user_email))
                {
                        die($m_errorHead."Please enter your email".$m_stReadErrorString.$m_errorTail);
                }

                $user_pass  = $wpdb->escape($_POST['landFirstPass']);

                if (empty($user_pass))
                {
                        die($m_errorHead."Please enter a password".$m_stReadErrorString.$m_errorTail);
                }

                $confirm_pass = $wpdb->escape($_POST['landAgainPass']);
                if (empty($user_pass))
                {
                        die($m_errorHead."You must input postcode!".$m_stReadErrorString.$m_errorTail);
                }

                if (isset($user_login))
                {
                        $table_name = $table_prefix . "users";
                        $m_stSearchUserSql = "SELECT `ID`,`user_email`,`user_login` FROM `" .$table_name."` WHERE `user_login` = '".$user_login."' OR `user_email` = '".$user_email."' LIMIT 1";
                        $m_stSearchUserResult = $wpdb->get_results($m_stSearchUserSql,ARRAY_A);
                        if ((!(empty($m_stSearchUserResult[0]['ID']))) || (!(empty($m_stSearchUserResult[0]['user_email']))))
                        {
                                if ($m_stSearchUserResult[0]['user_email'] == $user_email)
                                {
                                        die($m_errorHead."This user email had been registered!".$m_stReadErrorString.$m_errorTail);
                                }

                                if (!(empty($m_stSearchUserResult[0]['ID'])))
                                {
                                        die($m_errorHead."This user name had been registered!".$m_stReadErrorString.$m_errorTail);
                                }
                        }
                        else
                        {
                                // -- Begin changes (2 of 3) for the Are You A Human PlayThru CAPTCHA alternative.
                                // -- End changes (1 of 3) -- //
                                // Use the AYAH object to get the score.
                                $score = $ayah->scoreResult();

                                // Only do the rest if the score is ok.
                                if ($score)
                                {
                                        $end_pass = md5($user_pass);
                                        $user_id = wp_create_user( $user_login, $end_pass, $user_email );
                                        if ( !$user_id )
                                        {
                                                die($m_errorHead."Sorry, We can not create new user now, please contact support!".$m_stReadErrorString.$m_errorTail);
                                        }
                                        else
                                        {
                                                $m_table = $table_prefix."users";
                                                $m_sql = "update `".$m_table."` set  `user_pass` = '".$end_pass."' where `ID` = '".$user_id."'";
                                                $m_result = $wpdb->query($m_sql);
                                                $m_stSiteURL = get_option('home');
                                                $m_stSiteURL = str_replace("http://","",$m_stSiteURL);
                                                $m_stSiteLink = get_option('home');
                                                $m_stTitle = "Congratulations, New user account created in ".$m_stSiteURL."!";
                                                $m_nowFormat = get_option('answeremailformat');
                                                if (!(empty($m_nowFormat)))
                                                {
                                                        $m_nowFormat = stripcslashes($m_nowFormat);
                                                        $m_nowFormat = stripcslashes($m_nowFormat);
                                                        $m_nowFormat = str_replace("{%username%}",$user_login,$m_nowFormat);
                                                        $m_nowFormat = str_replace("{%sitename%}",$m_stSiteURL,$m_nowFormat);
                                                        $m_nowFormat = str_replace("{%sitelink%}",$m_stSiteLink,$m_nowFormat);
                                                        $m_nowFormat = str_replace("{%password%}",$user_pass,$m_nowFormat);
                                                        $m_stMessage = "<pre>".$m_nowFormat."</pre>";
                                                }
                                                else
                                                {
$m_stMessage = "<pre>
$user_login:

Welcome to <a href='$m_stSiteLink'>$m_stSiteURL</a>

Your username is $user_login and your password is:$user_pass,

Regards, $m_stSiteURL

</pre>
";
/*
$m_stMessage = "<pre>
Congratulations:

  Welcome to <a href='$m_stSiteLink'>$m_stSiteURL</a>
  Your account: <b><i>$user_login</i></b> had been created
  Your password is:$user_pass
  thanks!

</pre>
";
*/
                                                }
                                                echo "<div><h2>Thank you</h2>".$m_stMessage;
                                                echo "<div style='float:right;'>";
                                                echo "You can click <a href='".get_option('home')."'> HERE </a> to continue .";
                                                echo "<br />";
                                                echo "<br />";
                                                echo $m_srReadSuccessTail."</div>";
                                                echo "<div style='clear:both;'></div>";

                                                $nowUserInfo = get_userdata(1);
                                                $fromAdminMail = $nowUserInfo->user_email;
                                                //$headers = "From: ". "Money Digger" ." <" . $fromAdminMail . ">\r\n";
                                                $headers = "From: ". get_option("blogname") ." <" . $fromAdminMail . ">\r\n";

                                                $m_checkURL = get_option('home')."/?page_id=".get_option('land_email_confirm');
                                                $me_title = "Thank you for your registration";

                                                mail($user_email,$me_title,$m_stMessage,$headers);
                                        }
                                }
                        }
                }

        }
        else
        {
                echo '<form id="registerFirstForm" action="" method="POST">';
                //echo '<div style="width:350px;border:1px solid #ccc;background:#eee;margin:3px 0px 50px 0px;padding:20px 18px;font-size:12px;font-family: Arial,Verdana,Sans-Serif;">';
                echo "<div>";
                echo '<h2>Signup here for your new account</h2>';
                echo '<br />';
                if ( FALSE == get_option('users_can_register') )
                {
                        echo "<p>";
                        echo "Sorry,At this time user registration is disabled. We will open registration soon!";
                        echo "</p>";
                        exit;
                }
                else
                {
                        echo '<label class="formlabel">Email:</label><br />';
                        echo '<input type="text" id="landRegisterEmail" name="landRegisterEmail"  class="input">';
                        echo '<label class="formlabel">Username:</label><br />';
                        echo '<input type="text" id="landRegisterUser" name="landRegisterUser"  class="input">';
                        echo '<label class="formlabel">Password :</label><br />';
                        echo '<input type="password" id="landFirstPass" name="landFirstPass"  class="input">';
                        echo '<br />';


                        echo '<br />';
                        echo '<input type="hidden" id="userHidden" name="userHidden" value="should not see this">';

                        // -- Begin changes (3 of 3) for the Are You A Human PlayThru CAPTCHA alternative.
                        // Use the AYAH object to get the HTML code needed to
                        // load and run the PlayThru™.
                        echo $ayah->getPublisherHTML();

                        echo '<button type="submit" id="usersubmit" name="usersubmit" value="Register" style="background:#4682b4;color:#fff;padding:3px 6px;margin-left:10px;"><span class="btn">Register</span></span></button>';
                }
                echo "</div>";
                echo '</form>';

        }
        echo "</div>";
}

?>