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<?
    $domain = $HTTP_HOST;

  if (ereg("www", $domain)) {
    $domain = explode(".", $domain);
    $domain = $domain[1] . "." . $domain[2];
  }

  switch($domain) {
    case "domain-eins.de":
      header("location:domain-eins.html");
      break;
    case "domain-zwei.de":
      header("location:domain-zwei.html");
      break;
    default:
      header("location:standard.html");
      break;
  }
?>