function blockAlternationCollapseExpand(divNum) {

  $('#targetText_'+divNum).slideToggle();

  if ( $('#targetText_'+divNum).css('height') == '1px' ) {
    $('#triggerAnchor_'+divNum).addClass('opened');
  } else {
    $('#triggerAnchor_'+divNum).removeClass('opened');
  }

}

function blockAlternationExpandAll(divId) {
  var count = $('#' + divId + ' .block').length;
  for (var i=1; i<=count; i++) {
    $('#targetText_'+i).show('slow');
    $('#triggerAnchor_'+i).addClass('opened');
  }
}

function blockAlternationCollapseAll(divId) {
  var count = $('#' + divId + ' .block').length;
  for (var i=1; i<=count; i++) {
    $('#targetText_'+i).hide('slow');
    $('#triggerAnchor_'+i).removeClass('opened');
  }
}