adding an check graphic to echeck section in checkout?

I just turned on the authorize.net echeck capability and to be frank.. I think it will be confusing for my customers unless I
show them a picture of a check and point out what number is
the account number and which is the routing number on a
check.

I am trying to figure out how to put a picture of a check
next to the echeck radio box section to help the user pick the
right numbers. I am stumped.

Any idea how I could make this happen? I was looking at
tpl_checkout_stacked.php and this appears to create the
radio buttons to pick their payment method. It basically just prints
all configured payment methods in a loop.

Thanks,
Mike

    <?php
      $radio_buttons = 0;
      for ($i=0, $n=sizeof($selection); $i<$n; $i++) {
    ?>

    <?php
        if (sizeof($selection) > 1) {
            if (empty($selection[$i]['noradio'])) {
     ?>
    <?php echo zen_draw_radio_field('payment', $selection[$i]['id'], ($selection[$i]['id'] == $_SESSION['payment'] ? true : false), 'id="pmt-'.$selection[$i]['id'].'"'); ?>
    <?php   } ?>
    <?php
        } else {

    ?>
    <?php echo zen_draw_hidden_field('payment', $selection[$i]['id']); ?>
    <?php
        }
    ?>