var checkedLength = checkedAnswers.length;
    hiddenInput1 = checkedAnswers[Math.floor(Math.random()*checkedLength)];
    if (checkedLength > 1) {
           do {
                hiddenInput2 = checkedAnswers[Math.floor(Math.random()*checkedLength)];
           } while(hiddenInput1 == hiddenInput2);
    }
 
    $(hiddenInput).val(hiddenInput1+" "+hiddenInput2);

<script type="text/javascript" charset="utf-8">    
  $(document).ready(function() {  
 
    // Identify the questions
    var thisQuestion = $('#question{QID}');
    var qHidden = thisQuestion.nextAll('.multiple-short-txt:eq(0)');
    var hiddenInput1 = $('input.text:eq(0)', qHidden);
    var hiddenInput2 = $('input.text:eq(1)', qHidden);
 
    // Hide qHidden
    qHidden.hide();
 
    // Class for "Other
    $('input.text', thisQuestion).closest('.answer-item').addClass('other-item');
 
    // Listener on the checkboxes
    $('input.checkbox', thisQuestion).on('change', function(e) {
      handleChecked();
    });
 
    // Listener on the "Other" input
    $('input.text', thisQuestion).on('keyup change', function(e) {
      setTimeout(function() {
        handleChecked();
      }, 250);
    });
 
    function handleChecked() {
      // Build an array of checked answers
      var checkedAnswers = [];
      $('input.checkbox:checked', thisQuestion).each(function(i) {
        if($(this).closest('.answer-item').hasClass('other-item')) {
          checkedAnswers.push($(this).closest('.answer-item').find('input.text').val());
        }
        else {
          checkedAnswers.push($.trim($(this).nextAll('.label-text:eq(0)').text()));
        }        
      });
 
      // Shuffle the array
      shuffleArray(checkedAnswers);
 
      // Load the hidden question with a random 2 items from the array
      $(hiddenInput1).val(checkedAnswers[0]);
      if(checkedAnswers.length > 1) {
        $(hiddenInput2).val(checkedAnswers[1]);
      }
      else {
        $(hiddenInput2).val('');
      }
 
      // Fire Expression Manager
      checkconditions(hiddenInput1.value, hiddenInput1.name, hiddenInput1.type);
      checkconditions(hiddenInput2.value, hiddenInput2.name, hiddenInput2.type);
    }
    });
 
  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;
  }
</script>

<script type="text/javascript" charset="utf-8">  $(document).ready(function() {  
 
    // Identify the questions
    var thisQuestion = $('#question{QID}');
    var qHidden = thisQuestion.nextAll('.multiple-short-txt:eq(0)');
    var hiddenInput1 = $('input.text:eq(0)', qHidden);
    var hiddenInput2 = $('input.text:eq(1)', qHidden);
 
    // Hide qHidden
    qHidden.hide();
 
    // Listener on the radios
    $('input.radio', thisQuestion).on('click', function(e) {
      handleChecked();
    });
 
    function handleChecked() {
      // Build an array of checked answers
      var checkedAnswers = [];
      $('input.radio:checked', thisQuestion).each(function(i) {
        if($(this).closest('td.answer-item').is(':last-child')) {
          checkedAnswers.push($(this).closest('tr.answers-list').find('.answertext').text());
        }        
      });
 
      // Shuffle the array
      shuffleArray(checkedAnswers);
 
      // Load the hidden question with 2 random items from the array
      $(hiddenInput1).val(checkedAnswers[0]);
      if(checkedAnswers.length > 1) {
        $(hiddenInput2).val(checkedAnswers[1]);
      }
      else {
        $(hiddenInput2).val('');
      }
 
      // Fire Expression Manager
      checkconditions(hiddenInput1.value, hiddenInput1.name, hiddenInput1.type);
      checkconditions(hiddenInput2.value, hiddenInput2.name, hiddenInput2.type);
    }
    });
 
  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;
  }
</script>