function toggle_content_visibility(event) {
  var elem = Event.element(event);
  elem_content = elem.next();
  if(elem_content){
		if(elem_content.visible()) {
	    new Effect.BlindUp(elem_content, {duration : 0.5});
	  } else {
	    new Effect.BlindDown(elem_content, {duration : 0.5});
			close_others(elem);
	  }
	}
}

function close_others(span) {
  $$('.squeezebox li.parent ul').each(function(ul) {
		if(!span.ancestors().include(ul) && (span.next() != ul)) {
			new Effect.BlindUp(ul, {duration : 0.5});
		}
  });
}

document.observe("dom:loaded", function() {
 	$$('.squeezebox li.parent span').each( function(e) {  
   	Event.observe(e, "click", toggle_content_visibility);
 	});
	$$('.squeezebox li.parent ul').each(function(ul) {  
   	if(ul.select("li.select").size() == 0) {
			ul.hide()
		}
 	});
});