IF...

includes/templates/CUSTOM/images/your_image_name.???


THEN.....

includes/languages/ENGLISH/header.php

define('HEADER_ALT_TEXT', 'Powered by Zen Cart :: The Art of E-Commerce');
define('HEADER_LOGO_WIDTH', '1020px');
define('HEADER_LOGO_HEIGHT', '155px');
define('HEADER_LOGO_IMAGE', 'your_image_name.???');





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