{rand(1,X)}

function maxDiff(qID, randomize) {
 
  // Identify some elements
  var thisQuestion = $('#question'+qID);
  var thisTable = $('table.subquestion-list:eq(0)', thisQuestion);
 
  // Assign a new question class
  $(thisQuestion).addClass('max-diff-array');
 
  // Move the columns
  $('thead tr:eq(0)', thisTable).prepend($('thead tr:eq(0) th:eq(1)', thisTable));
  $('tr.answers-list', thisTable).each(function(i){
    $('td.answer-item:eq(0)', this).prependTo(this);
  });
 
  // Random rows
  if(randomize) {
    var rowsArr = [];
    $('tr.answers-list', thisTable).each(function(i){
      $(this).attr('data-index', i);
      rowsArr.push(i);
    });
    shuffleArray(rowsArr);
    $(rowsArr).each(function(i){
      $('tbody', thisTable).append($('tr[data-index="'+this+'"]', thisTable));
    });
  }
 
  // Prevent clicking twice in the same row
  $('input:radio', thisQuestion).on('click', function () {
 
    $('input:radio', thisQuestion).prop('disabled', false);
    $('input:radio:checked', thisQuestion).each(function(i) {
      var thisRow = $(this).closest('tr.answers-list');
      $('input:radio', thisRow).not(this).prop('disabled', true);
    });
  });  
 
  // Fix up the row classes
  var rowClass = 1;
  $('tr.answers-list', thisTable).each(function(i) {
    $(this).addClass('array'+(2-(i%2)));
  });
}
 
function shuffleArray(array) {
  for (var i = array.length - 1; i > 0; i--) {
    var j = Math.floor(Math.random() * (i + 1));
    var temp = array[i];
    array[i] = array[j];
    array[j] = temp;
  }
  return array;
}