// Initialize.
function init_accordion() {

  // Does element exist?
  if (!$('dl.accordion').length) {

    // If not, exit.
    return;
  }

  // Gather all accordions.
  $('dl.accordion').each(function() {

    // Reveal first accordion item.
    $(this).find('dt:first a').addClass('accordion_expanded').end().find('dd:first').show();

    // Added to round corners via CSS.
    $(this).find('dt:last').addClass('last');
  });

  // Event listener for click.
  $('dl.accordion dt a').click(function() {

    // Get parent <dl>.
    var $dl = $(this).parents('dl:first');

    // Get the next <dd>.
    var $dd = $(this).parent('dt').next('dd');

    // Class final <dt>.
    function findLast() {
      if ($dl.find('dd:last').is(':hidden')) {
        $dl.find('dt:last').addClass('last');
      }
    }

    // Is it visible?
    if ($dd.is(':hidden')) {

      // Expand the <dd>, hide others.
      $dd.slideDown('fast').siblings('dd:visible').slideUp('fast', findLast);

      // Change arrow state, remove class="last" from <dt>.
      $(this).addClass('accordion_expanded').parent('dt').removeClass('last').siblings('dt').find('a').removeClass('accordion_expanded');
    }

    // Nofollow.
    this.blur();
    return false;
  });
}

// Kick things off.
$(document).ready(function() {
  init_accordion();
});