On the payment information page the continue button shows a red X. I have a button created but I don't know what tpl file to look in to find out how to insert the button. I looked at tpl_checkout_payment_defautl_php and it looks as if the correct code is there. how do i get the image to appear.

<div class="buttonRow forward"><?php echo zen_image_submit(BUTTON_IMAGE_CONTINUE_CHECKOUT, BUTTON_CONTINUE_ALT, 'onclick="submitFunction('.zen_user_has_gv_account($_SESSION['customer_id']).','.$order->info['total'].')"'); ?></div>
<div class="buttonRow Back"><?php echo TITLE_CONTINUE_CHECKOUT_PROCEDURE . '<br />' . TEXT_CONTINUE_CHECKOUT_PROCEDURE; ?></div>