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I can see what's going wrong, but don't know why or how to fix...
The admin page is mydomain/catalog/admin/index.php, but when I click any of the links to configuration, categories etc, it is looking for the pages configuration.php, categories.php etc. in mydomain/admin/configuration.php which is not the right directory.

why is this happening? how do I point it to the catalog/admin/ directory, where the files are? Thanks.

It would help to see your configure.php file in admin/includes.

Thanks for your reply.
Here's configure.php from admin/includes

<?php
/*
$Id: configure.php,v 1.14 2003/02/21 16:55:24 dgw_ Exp $

osCommerce, Open Source E-Commerce Solutions
http://www.oscommerce.com

Copyright © 2002 osCommerce

Released under the GNU General Public License
*/

// define our webserver variables
// FS = Filesystem (physical)
// WS = Webserver (virtual)
define('HTTP_SERVER', ''); // eg, http://localhost or - https://localhost should not be NULL for productive servers
define('HTTP_CATALOG_SERVER', '');
define('HTTPS_CATALOG_SERVER', '');
define('ENABLE_SSL_CATALOG', 'false'); // secure webserver for catalog module
define('DIR_FS_DOCUMENT_ROOT', $DOCUMENT_ROOT); // where your pages are located on the server. if $DOCUMENT_ROOT doesnt suit you, replace with your local path. (eg, /usr/local/apache/htdocs)
define('DIR_WS_ADMIN', '/admin/');
define('DIR_FS_ADMIN', DIR_FS_DOCUMENT_ROOT . DIR_WS_ADMIN);
define('DIR_WS_CATALOG', '/catalog/');
define('DIR_FS_CATALOG', DIR_FS_DOCUMENT_ROOT . DIR_WS_CATALOG);
define('DIR_WS_IMAGES', 'images/');
define('DIR_WS_ICONS', DIR_WS_IMAGES . 'icons/');
define('DIR_WS_CATALOG_IMAGES', DIR_WS_CATALOG . 'images/');
define('DIR_WS_INCLUDES', 'includes/');
define('DIR_WS_BOXES', DIR_WS_INCLUDES . 'boxes/');
define('DIR_WS_FUNCTIONS', DIR_WS_INCLUDES . 'functions/');
define('DIR_WS_CLASSES', DIR_WS_INCLUDES . 'classes/');
define('DIR_WS_MODULES', DIR_WS_INCLUDES . 'modules/');
define('DIR_WS_LANGUAGES', DIR_WS_INCLUDES . 'languages/');
define('DIR_WS_CATALOG_LANGUAGES', DIR_WS_CATALOG . 'includes/languages/');
define('DIR_FS_CATALOG_LANGUAGES', DIR_FS_CATALOG . 'includes/languages/');
define('DIR_FS_CATALOG_IMAGES', DIR_FS_CATALOG . 'images/');
define('DIR_FS_CATALOG_MODULES', DIR_FS_CATALOG . 'includes/modules/');
define('DIR_FS_BACKUP', DIR_FS_ADMIN . 'backups/');

// define our database connection
define('DB_SERVER', 'localhost');
define('DB_SERVER_USERNAME', 'n8tl********');
define('DB_SERVER_PASSWORD', '*******');
define('DB_DATABASE', 'n8tl******');
define('USE_PCONNECT', 'false');
define('STORE_SESSIONS', '');
?>

Any help would be great, thanks!