$(document).ready( function () {
  $('div#accordion h2#firstAccordion').addClass('active');
  $('div#accordion h2#firstAccordion').next().addClass('open').show();

  $('div#accordion h2').click( function () {
    $('div#accordion div.content').removeClass('open');
    $('div#accordion h2').removeClass('active');
    $(this).addClass('active');
    $(this).next().addClass('open').slideDown('fast');
    $('div#accordion div.content:not(.open)').slideUp('fast');
  } );
} );