function expandContractHandler(event) {
  $(this).parents('tr').nextAll('tr').slideToggle("normal");
  
  if($(this).text().match(/expand/))
    $(this).text('Click here to contract document');
  else
    $(this).text('Click here to expand document');
    
  return false;
}

$(document).ready(function() {
  $('table.research tr').hide();
  
  var headers = $('table.research tr.research-first');
  headers.show();

  headers.each(function() {    
    if($(this).parents('table.research').find('tr:not(.research-first)').length > 0) {
      $(this).children('td:first').append('<br />or ');
      $(document.createElement('a')).attr('href', '#').addClass('expand-link').text('Click here to expand document').appendTo($(this).children('td:first')).click(expandContractHandler);
    }
  });
});