function filterArrByCol(qMultiOpt, qArray, prevPage) {
 
  // If filter question is on a previous page, hide Q1 and check all "visible" boxes
  if(prevPage == 1) {
    $('#question'+qMultiOpt+' li[id</div>="javatbd"]:visible input.checkbox').attr('checked', true);
    $('#question'+qMultiOpt+'').hide();
  }
 
  // Assign classes to the answer cells
  $('#question'+qArray+' td.answer-item').each(function(i){
    var classArr = $(this).attr('class').split('answer_cell_00');
    classArr = classArr[1].split(' ');
    var ansCode = classArr[0];
    $(this).addClass('ans-'+ansCode+' filtered');
  });
 
  // Assign classes to the answer label cells
  $('#question'+qArray+' table.subquestions-list tbody tr:eq(0) td.answer-item').each(function(i){
    var classArr2 = $(this).attr('class').split(' ans-');
    var ansCode2 = classArr2[1];
    $('#question'+qArray+' table.subquestions-list thead tr:eq(0) th:eq('+i+')').addClass('ans-'+ansCode2+'');
  });
 
  // Fire the filter function on page load
  filterArr(qMultiOpt, qArray);
 
  // Listener on multi-opt checkboxes to fire the filter function
  $('#question'+qMultiOpt+' input.checkbox').click(function(){
    filterArr(qMultiOpt, qArray);
  });
 
  // On submit, clear all hidden radios of array
  $('#movenextbtn, #movesubmitbtn').click(function(){
    $('#question'+qArray+' td.filtered:hidden').each(function(i){
        $('input.radio', this).prop('checked', false);
    });
    return true;
  });
}
 
function filterArr(qMultiOpt, qArray) {
 
  if($('#question'+qMultiOpt+' input.checkbox:checked').length < 1) {
    // Hide the array if no multi-opt options are checked
    $('#question'+qArray+'').hide();
  }
  else {
    $('#question'+qArray+'').show();
 
    // Hide all columns of array
    $('#question'+qArray+' table.subquestions-list tbody td.answer-item, #question'+qArray+' table.question thead th').hide();
 
    // Loop through multi-opt checkboxes and, if checked, show corresponding column of array
    $('#question'+qMultiOpt+' input.checkbox').each(function(i){
      if($(this).prop('checked') == true) {
        var classArr3 = $(this).attr('id').split('X'+qMultiOpt);
        var ansCode3 = classArr3[1];
        $('#question'+qArray+' .ans-'+ansCode3+'').show();
      }
    });
  }
}