//queued showing and hiding
$(document).ready(function() {
  $('div.a2 > div.c2').hide();  
  $('div.a2 > div.b2').click(function() {
    var $nextDiv = $(this).next();
    var $visibleSiblings = $nextDiv.siblings('div.c2:visible');

    if ($visibleSiblings.length ) {
      $visibleSiblings.slideUp('fast', function() {
        $nextDiv.slideToggle('fast');
      });
    } else {
       $nextDiv.slideToggle('fast');
    }
  });

setTimeout('$(\'div.a2 > div.b2\').click()',500);

});