Drupal.behaviors.collapser = function(c) {
  // simplify, simplify, simplify!
  $('div.form.collapsible>h3.collapser.collapsible').each(function(){
    this.onclick = function() {
      $(this).next().slideToggle();
    }
  });
  $('div.form.collapsible.collapsed>h3.collapser.collapsible').each(function(){
    this._collapsed = true;
  });
};