<form action="<?php echo str_replace('&', '&amp;', $action); ?>" method="post" id="checkout">
  <input type="hidden" name="pay_to_email" value="<?php echo $pay_to_email; ?>" />
  <input type="hidden" name="recipient_description" value="<?php echo $description; ?>" />
  <input type="hidden" name="transaction_id" value="<?php echo $transaction_id; ?>" />
  <input type="hidden" name="return_url" value="<?php echo $return_url; ?>" />
  <input type="hidden" name="cancel_url" value="<?php echo $cancel_url; ?>" />
  <input type="hidden" name="status_url" value="<?php echo $status_url; ?>" />
  <input type="hidden" name="language" value="<?php echo $language; ?>" />
  <input type="hidden" name="logo_url" value="<?php echo $logo; ?>" />
  <input type="hidden" name="pay_from_email" value="<?php echo $pay_from_email; ?>" />
  <input type="hidden" name="firstname" value="<?php echo $firstname; ?>" />
  <input type="hidden" name="lastname" value="<?php echo $lastname; ?>" />
  <input type="hidden" name="address" value="<?php echo $address; ?>" />
  <input type="hidden" name="address2" value="<?php echo $address2; ?>" />
  <input type="hidden" name="phone_number" value="<?php echo $phone_number; ?>" />
  <input type="hidden" name="postal_code" value="<?php echo $postal_code; ?>" />
  <input type="hidden" name="city" value="<?php echo $city; ?>" />
  <input type="hidden" name="state" value="<?php echo $state; ?>" />
  <input type="hidden" name="country" value="<?php echo $country; ?>" />
  <input type="hidden" name="amount" value="<?php echo $amount; ?>" />
  <input type="hidden" name="currency" value="<?php echo $currency; ?>" />
  <input type="hidden" name="detail1_text" value="<?php echo $detail1_text; ?>" />
  <input type="hidden" name="merchant_fields" value="order_id" />
  <input type="hidden" name="order_id" value="<?php echo $order_id; ?>" />
</form>
<div class="buttons">
  <table>
    <tr>
      <td align="left"><a onclick="location = '<?php echo str_replace('&', '&amp;', $back); ?>'" class="button"><span><?php echo $button_back; ?></span></a></td>
      <td align="right"><a onclick="$('#checkout').submit();" class="button"><span><?php echo $button_confirm; ?></span></a></td>
    </tr>
  </table>
</div>