<script type="text/javascript" charset="utf-8">  
 
  $(document).ready(function() {
 
    // The error message
    var errorMsg = 'You can only select one answer per column';
 
    // Identify the question
    var qID = {QID};
    var thisQuestion = $('#question'+qID);
 
    // Listener on the radios
    $('.radio-item', thisQuestion).click(function(event) {
      // Check for more than one answer per column
      var answerCode = $(this).attr('class').split('answer_cell_00')[1].split(' ')[0];
      if($('.answer_cell_00'+answerCode+' input[type="radio"]:checked', thisQuestion).length > 1) {
        alert(errorMsg);
        $('input[type="radio"]', this).attr('checked', false);
      }
    });
  });
</script>

<script type="text/javascript" charset="utf-8">  
 
  $(document).ready(function() {
 
    // The error message
    var errorMsg = 'You can only select one answer per row';
 
    // Identify the question
    var qID = {QID};
    var thisQuestion = $('#question'+qID);
 
    // Listener on the radios
    $('.radio-item', thisQuestion).click(function(event) {
      // Check for more than one answer per row
      var thisRow = $(this).closest('tr');
      if($('input[type="radio"]:checked', thisRow).length > 1) {
        alert(errorMsg);
        $('input[type="radio"]', this).attr('checked', false);
      }
    });
  });
</script>