gistfile1.txt

(function($) {
  $(document).ready(function() {
    $("input[type=radio]").click(function() {
      // Get the storedValue
      var previousValue = $(this).data('storedValue');
      // if previousValue = true then
      //     Step 1: toggle radio button check mark.
      //     Step 2: save data-StoredValue as false to indicate radio button is unchecked.
      if (previousValue) {
        $(this).prop('checked', !previousValue);
        $(this).data('storedValue', !previousValue);
      }
      // If previousValue is other than true
      //    Step 1: save data-StoredValue as true to for currently checked radio button.
      //    Step 2: save data-StoredValue as false for all non-checked radio buttons.
      else{
        $(this).data('storedValue', true);
        $("input[type=radio]:not(:checked)").data("storedValue", false);
      }
    });
  });
})(jQuery);