Category Tab Simple Dropdown Menu show sub categories within sub categories??

Hi am using Category Tab Simple Dropdown Menu from here http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=1448

on a clients site, its installed on zen cart 1.38a

it works fine but the client now wants to have subcategories in the sub categories and want them to display also in the drop down.

is there a way i can edit this coding so it does this??

basically at the mo there top end cats display across the top and when scrolled over the sub cats display as a drop down, but if they have another category in one of the sub cats this does not show, they want this to display to the right of the sub cat when scrolled over

just like how this site does it missguided.co.uk

can anyone please help me???

This is a question to post in the contributions area and not in "General Questions" where stock code issues are addressed

Also read the module text

It is a** single level only** so it will display subcategories or products depending on what the category contains
There are others that you can select from