This problem has been kicking my ass, it really shouldn’t be this complicated to do what I want:

I have two categories of questions, each category contains seven different questions. I want to:

1) Randomly ask a question from one of the two categories (randomly deciding which category is first)
2) Randomly ask a question from the other category
3) Ask them 1 of 2 controls, randomly chosen
4) Randomly ask a question from the first category (making sure to not ask the same question as #1)
5) Randomly ask a question from the second category (making sure to not ask the same question as #2)

Each question consists of an image and four radio buttons. Each of the radio buttons is actually the same (asking them which item from the given image they would choose). I just need to keep track of which image is being shown each time (and then which button they clicked in response to the given image).

Any help would be greatly appreciated.