<script type="text/javascript" charset="utf-8">  
  $(document).ready(function() {
 
    // Identify the questions
    var qID = {QID};
    var thisQuestion = $('#question'+qID);
    var quotaQuestion = $(thisQuestion).nextAll('.list-radio:eq(0)');
 
    // The sub-question code of the mandatory option
    var mandatoryOptionCode = 'b';
 
    // Hide the quota question
    $(quotaQuestion).hide();
 
    // Interrupt the Next/Submit function
    $('form#limesurvey').submit(function(){
 
      // Is the mandatory option checked?
      if($('input.checkbox[id$="X'+qID+mandatoryOptionCode+'"]').is(':checked') == false) {
        // No, so click the quota radio
        $('input.radio', quotaQuestion).click();
      }
      else {
        // Yes, so uncheck the quota radio
        $('input.radio', quotaQuestion).attr('checked', false);
      }
    });
  });
</script>