Multi Checkbox: Clearing or Disabling Other Values

[furstlars]

I would like to know how I can achieve the following through Javascript:

If "None required" is selected, all other previously selected values should be unchecked, and then disabled.

[SimonMuntz]

What happens if the user clicks this choice by mistake? How ill they change it if all is disabled?

[furstlars]

Hi Simon,

By unchecking "None required" again, the other options should be enabled again.