in /includes/languages/english/modules/payment/dirbank.php
find
Code:
 define('MODULE_PAYMENT_DIRBANK_TEXT_DESCRIPTION',  
  '<BR>Please use the following details to transfer your total order value:<br><pre>' .  
  "\nAccount No.:  " . MODULE_PAYMENT_DIRBANK_ACCNUM . 
  "\nBSB Number:   " . MODULE_PAYMENT_DIRBANK_BSB .  
  "\nAccount Name: " . MODULE_PAYMENT_DIRBANK_ACCNAM .  
  "\nBank Name:    " . MODULE_PAYMENT_DIRBANK_BANKNAM . 
  "\nSwift Code:   " . MODULE_PAYMENT_DIRBANK_SWIFT .  
  '</pre><p>Thanks for your order which will ship immediately we receive payment in the above account.');
replace it with
Code:
 define('MODULE_PAYMENT_DIRBANK_TEXT_DESCRIPTION', 
  '<BR><font size="2" color="#000000">Please use the following details to transfer your total order value:<br>' .
  "<br>\nBSB Number:<br> " . MODULE_PAYMENT_DIRBANK_BSB .
  "<br>\nAccount No.:<br>  " . MODULE_PAYMENT_DIRBANK_ACCNUM .
  "<br>\nAccount Name:<br> " . MODULE_PAYMENT_DIRBANK_ACCNAM .
  "<br>\nBank Name:  <br>  " . MODULE_PAYMENT_DIRBANK_BANKNAM .
  '</font><p>Thanks for your order which will ship immediately we receive payment in the above account.');