// A function to randomly display one row of an array type question
function showRandomRow(qid) {
 
  // Identify this question
  var thisQuestion = $('#question'+qid);
 
  // Hide the "N/A" column
  $('table.subquestions-list tr > :last-child', thisQuestion).addClass('na-column').hide();
 
  // If question not previously seen...
  if($('.na-column input.radio:checked', thisQuestion).length == 0) {      
    // Hide all answer rows
    $('tr.answers-list', thisQuestion).hide();
 
    // Create an array of answer row IDs
    var rowIDs = [];
    $('tr.answers-list', thisQuestion).each(function(i) {
      rowIDs.push($(this).attr('id'));
    });
 
    // Shuffle the array
    rowIDs = $.shuffle(rowIDs);
 
    // Show the first row in the array
    $('#'+rowIDs[0]).removeClass('array1').addClass('array2').show();
 
    // Click "N/A" in all hidden rows
    $('tr.answers-list:hidden .na-column input.radio', thisQuestion).trigger('click');
  }
  // If question previously seen...
  else {      
    // Hide answer rows that have "N/A" clicked 
    $('.na-column input.radio:checked', thisQuestion).closest('tr.answers-list').hide();
  }
}
 
// A function to shuffle elements or contents of arrays
(function($){
  $.fn.shuffle = function() {
    return this.each(function(){
      var items = $(this).children();
      return (items.length)
        ? $(this).html($.shuffle(items))
        : this;
    });
  }
 
  $.shuffle = function(arr) {
    for(
      var j, x, i = arr.length; i;
      j = parseInt(Math.random() * i),
      x = arr[--i], arr[i] = arr[j], arr[j] = x
    );
    return arr;
 
  }
})(jQuery);

<script type="text/javascript" charset="utf-8">    
  $(document).ready(function() {  
    showRandomRow({QID});  
  });
</script>