Can I substitute an image in place of the radio button?

In my form (http://www.brianforflorida.com/donate/), I'd like to utilize the $ denomination buttons as the radio button and eliminate the actual radio button altogether.  Is that possible?

If I understood you correctly you want to eliminate radio buttons and to make $ amount sign to represent radio buttons. That is not possible to do because if you hide radio buttons user will not be able to select amount. In case that something is clicked it will not be marked that is selected and it will not pass values to payment tool.

Hope this will help. Let us know if you need further assistance.