How to clear two sets of radio buttons based on a checkbox in a side by side item? JavaScript?

I'm building a survey of side-by-side questions and wish to have an N/A column:

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What I would like to do with javascript code is implement custom behavior with the N/A checkbox such that, when clicked, the row of radio buttons (across the two columns to the right) are cleared if they were previously selected (and possibly grayed-out?). Conversely, if the user selects the N/A checkbox, and then enters a frequency or importance rating, the N/A checkbox is cleared. How can I best implement this behavior?

Thanks for any information on this!