$(function() {
  $("#nav-category > div.collapsible > div.title").click(function() {
    var $that = $(this).siblings("div.listbox");
    if (!$that.is(":visible")) {
      var $this = $("#nav-category > div.collapsible > div.listbox:visible");
      
      function onAllClosed() {
        $this.removeAttr("style");
        $that.slideToggle($that.find("li").length * 70);
      }
      
      $this.stop().slideToggle($this.find("li").length * 35, onAllClosed);
      
      if ($this.length == 0) onAllClosed();
    }
  });
  
  // Display any active navigation list
  $("#nav-category li.active, #nav-category a.active").closest("div.listbox").show();
});