Here's beta.oo It now has the ruby and html codes rewritten to suit PC AND MAC when altering checkboxes' 'checked' status and the consequent resetting of all of the elements' 'disabled' status.
I am quite hopeful this should now work correctly on both PC [tested OK] and MAC [needs testing]...
Feedback please... especially from MAC users regarding the checkboxes' toggling and the related 'disabled' status of the their options - and the remembering of settings during and across sessions...