Radio Buttons

I have 2 questions regarding radio buttons:1. Is it possible to change the graphic of the default radio button? Currently when selected a small red dot appears. I need to change the color or even a different style.2. How do I restrict changing a choice once a selection is made? Either giving the user one chance to select, or two chances to select the correct choice. After that the user cannot change their answer and must move on to the next question.Thanks- kevin

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