Displaying shipping icons on Invoice and Customer emails?

[willieWontGo]

I am using v1.3.9h.

I have USPS and UPS as the shipping modules.

Managed to get the USPS/UPS shipping icons to display on the shipping estimator page using this line of code:

<?php if (isset($quotes[$i]['icon']) && zen_not_null($quotes[$i]['icon'])) { echo $quotes[$i]['icon']; } ?>

I would like to display them on the invoice that will be printed by me - to insert in the package, as well as show up in the customer's order confirmation email.

Any ideas how to do configure it?

I had previously made it happen on an older zen installation, but forgot what I did

Thanks in advance. :)