OK, I hope someone can help me because I screwed up and did not do a backup before uploading the files

The module seems to be working fine BUT I now cannot pull up the customer and/or order lists. I get the following error:

Fatal error: Call to undefined function: zen_get_customers_address_book() in /.../customers.php on line 1125 (address edited for security)

This is the line:
$zc_address_book_count_list = zen_get_customers_address_book($customers->fields['customers_id']);

I get a similar fatal error in orders.php on line 819

This is the line:
<td class="dataTableContent" align="center"><?php echo (zen_get_orders_comments($orders->fields['orders_id']) == '' ? '' : zen_image(DIR_WS_IMAGES . 'icon_yellow_on.gif', TEXT_COMMENTS_YES, 16, 16)); ?></td>

Any suggestions as to where I go from here??