Drill down menu

Hi Folks,

I wonder if there is anybody out there that may be able to give me some advice...

I am looking for a mod for my site which is effectively a drill down menu.

It will be made up of two drop down menus, Make and Model. Once a make and model has been selected it will then direct you to a product page.

An example of this can be found here: http://www.tillfood.co.uk/ shown as their quick find at the top for till rolls.

Can anyone out there advise me of any existing mods that can do this and if not, can anybody make me one?

Im running opencart 1.5.6 and all of the products are already setup.

Thanks