<ul id="accordion">
    <li>
        <a class="accordion-link">Link 1</a>
        <div class="accordion-contents">Contents 1</div>
    </li>
    <li>
        <a class="accordion-link">Link 2</a>
        <div class="accordion-contents">Contents 2</div>
    </li>
    <li>
        <a class="accordion-link">Link 3</a>
        <div class="accordion-contents">Contents 3</div>
    </li>
</ul>

  $('ul#accordion div.accordion-contents').hide().parent().addClass('accordion-closed');
  $('ul#accordion a.accordion-link').click(function() {
      $('div.contents:visible', $(this).parent().parent()).slideUp('fast').parent().addClass('accordion-closed').removeClass('accordion-opened');
      $(this).next('div').slideToggle('fast').parent().addClass('accordion-opened').removeClass('accordion-closed');
    });