[carpeperdiem]

To add HTML tags to the "payment_details" field, in file:

/admin/payment_methods.php

FIND:

require "./auth.php";

REPLACE WITH:

define('USE_TRUSTED_POST_VARIABLES',1);
$trusted_post_variables = array("posted_data");
require "./auth.php";

Then in the "special instructions" in the payment methods (in the admin) add your html, such as:

<img src="/skin1/images/creditcards.gif" border="0" /><br />
VISA, AMEX, Discover, Mastercard