rollover images for category intro images

-- url of the page with the problem -- : 181.224.148.114/~carra2/
-- HikaShop version -- : 2.6.1
-- Joomla version -- : 3.4.8
-- PHP version -- : 5.3.29

At the moment the test homepage displays the product categories with a single image.
181.224.148.114/~carra2/

What I would like is to be able to specify a rollover image (with a dae) as well, or for one to be displayed on mouse over.

Eg

Image1.jpg the main image
Image1_r.jpg the rollover image

We could upload the rollover image via ftp etc, so no need for a facility in admin to do this.

Thanks. Thanks for choosing us for this project. Looking forward to work with you again.