Hide radio buttons and use images in landscape on a form

Hi

I'm hoping someone can help me - and it's probably (or at least i think it is) some css that I need.

I'm wanting to make the form here - http://bez.xcelsupport.com/form/ - to use images like it does for people to click, and get rid of the radio button so they just see the image - BUT, I want the image to be landscape rather than portrait.

Basically, the form will have 4 questions - and I want users to be able to answer each question by clicking the image that best suits their setup.

Any tips? Or any better form builders to do that easier? At the moment, its using GF for it.

Thanks
Farzan