$(document).ready(function() {
   
   // hide the filter choices (except for type when present)
   $('#left_nav ul ul.faceted li h4 a[class!="open"]').each(function() {
      $(this).parent().next().toggle();
   });
   
   // register click handlers for nav
   $('#left_nav ul ul.faceted li h4 a').click(function() {   
      $(this).parent().next().toggle('fast');
      $(this).toggleClass('open');
      return false;
   });
});