<script type="text/javascript" charset="utf-8">  
    $(document).ready(function(){
 
    // Identify this question
    var thisQuestion = $('#question{QID}');
 
    // Insert the new header row
    $('table.subquestions-list thead', thisQuestion).prepend('<tr class="new-header">\
      <td>&amp;nbsp;</td>\
      <th colspan="6" style="text-align:left;">Not at all important</th>\
      <th colspan="5" style="text-align:right;">Extremely important</th>\
      <th></th>\
    </tr>');
  });
</script>