function GetIP(){
  if(getenv("HTTP_CLIENT_IP")) {
    $ip = getenv("HTTP_CLIENT_IP");
  } elseif(getenv("HTTP_X_FORWARDED_FOR")) {
    $ip = getenv("HTTP_X_FORWARDED_FOR");
    if (strstr($ip, ',')) {
      $tmp = explode (',', $ip);
      $ip = trim($tmp[0]);
    }
  } else {
    $ip = getenv("REMOTE_ADDR");
  }
  return $ip;
}