Issues with registration page...

<?php require_once('../Connections/Users.php'); ?>
<?php require_once("../WA_ValidationToolkit/WAVT_Scripts_PHP.php"); ?>
<?php require_once("../WA_ValidationToolkit/WAVT_ValidatedForm_PHP.php"); ?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") 
{
  if (PHP_VERSION < 6) {
    $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue;
  }

  $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue);

  switch ($theType) {
    case "text":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;    
    case "long":
    case "int":
      $theValue = ($theValue != "") ? intval($theValue) : "NULL";
      break;
    case "double":
      $theValue = ($theValue != "") ? doubleval($theValue) : "NULL";
      break;
    case "date":
      $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL";
      break;
    case "defined":
      $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue;
      break;
  }
  return $theValue;
}
}

mysql_select_db($database_Users, $Users);
$query_orgcode = "SELECT * FROM orgcode";
$orgcode = mysql_query($query_orgcode, $Users) or die(mysql_error());
$row_orgcode = mysql_fetch_assoc($orgcode);
$totalRows_orgcode = mysql_num_rows($orgcode);
?> 
<?php 
if ((((isset($_POST["Register"]))?$_POST["Register"]:"") != ""))  {
  $WAFV_Redirect = "access-denied.php";
  $_SESSION['WAVT_register1_Errors'] = "";
  if ($WAFV_Redirect == "")  {
    $WAFV_Redirect = $_SERVER["PHP_SELF"];
  }
  $WAFV_Errors = "";
  $WAFV_Errors .= WAValidateNM($totalRows_orgcode . "",-1,0,"",",.",true,1);

  if ($WAFV_Errors != "")  {
    PostResult($WAFV_Redirect,$WAFV_Errors,"register1");
  }
}
?>
<?php
// *** Redirect if username exists
$MM_flag="MM_insert";
if (isset($_POST[$MM_flag])) {
  $MM_dupKeyRedirect="duplicate.php";
  $loginUsername = $_POST['emailaddress'];
  $LoginRS__query = sprintf("SELECT emailaddress FROM users WHERE emailaddress=%s", GetSQLValueString($loginUsername, "text"));
  mysql_select_db($database_Users, $Users);
  $LoginRS=mysql_query($LoginRS__query, $Users) or die(mysql_error());
  $loginFoundUser = mysql_num_rows($LoginRS);

  //if there is a row in the database, the username was found - can not add the requested username
  if($loginFoundUser){
    $MM_qsChar = "?";
    //append the username to the redirect page
    if (substr_count($MM_dupKeyRedirect,"?") >=1) $MM_qsChar = "&";
    $MM_dupKeyRedirect = $MM_dupKeyRedirect . $MM_qsChar ."requsername=".$loginUsername;
    header ("Location: $MM_dupKeyRedirect");
    exit;
  }
}
?>
<?php
$editFormAction = $_SERVER['PHP_SELF'];
if (isset($_SERVER['QUERY_STRING'])) {
  $editFormAction .= "?" . htmlentities($_SERVER['QUERY_STRING']);
}
?>
<?php
if ((isset($_POST["MM_insert"])) && ($_POST["MM_insert"] == "WAATKRegistrationForm")) {
  $insertSQL = sprintf("INSERT INTO users (emailaddress, password, orgcode, receiveEmails) VALUES (%s, %s, %s, %s)",
                       GetSQLValueString($_POST['emailaddress'], "text"),
                       GetSQLValueString($_POST['password'], "text"),
                       GetSQLValueString($_POST['orgcode'], "text"),
                       GetSQLValueString($_POST['receiveEmails'], "text"));

  mysql_select_db($database_Users, $Users);
  $Result1 = mysql_query($insertSQL, $Users) or die(mysql_error());

  $insertGoTo = "login.php";
  if (isset($_SERVER['QUERY_STRING'])) {
    $insertGoTo .= (strpos($insertGoTo, '?')) ? "&" : "?";
    $insertGoTo .= $_SERVER['QUERY_STRING'];
  }
  header(sprintf("Location: %s", $insertGoTo));
}
?>