Usage

$(function() {
  var Accordion = $('#accordion');

  Accordion.switchable({
    triggers: Accordion.find('dt'),
    triggerType: 'click',
    panels: 'dd',
    effect: 'accordion',
    multiple: true,
    initIndex: null // new value only for accordion
  });
});

/*
 * Remember to set the border-width for the accordion's panels,
 * even without border
 */
#accordion dd {
  border: 1px solid #343434;
  border-top-width: 0;
}