I am using ZC 1.3.9 and have cloned the cheque/money order payment module to use for bank deposit and western union and a couple of other payment methods.

I would like to add a logo next to each of the payment methods I have available in the checkout page. Is it possible by adding some code to the includes/modules/payment/paymentmethod.php
and
includes/languages/english/modules/payment/paymentmethod.php files?

If so what would be the code to add?