function addEvent( obj, type, fn ) {
	if (obj.addEventListener) {
		obj.addEventListener( type, fn, false );
		EventCache.add(obj, type, fn);
	}
	else if (obj.attachEvent) {
		obj["e"+type+fn] = fn;
		obj[type+fn] = function() { obj["e"+type+fn]( window.event ); }
		obj.attachEvent( "on"+type, obj[type+fn] );
		EventCache.add(obj, type, fn);
	}
	else {
		obj["on"+type] = obj["e"+type+fn];
	}
}

var EventCache = function(){
	var listEvents = [];
	return {
		listEvents : listEvents,
		add : function(node, sEventName, fHandler){
			listEvents.push(arguments);
		},
		flush : function(){
			var i, item;
			for(i = listEvents.length - 1; i >= 0; i = i - 1){
				item = listEvents[i];
				if(item[0].removeEventListener){
					item[0].removeEventListener(item[1], item[2], item[3]);
				};
				if(item[1].substring(0, 2) != "on"){
					item[1] = "on" + item[1];
				};
				if(item[0].detachEvent){
					item[0].detachEvent(item[1], item[2]);
				};
				item[0][item[1]] = null;
			};
		}
	};
}();

addEvent(window, 'unload', EventCache.flush);

function removeEvents(elem, type, handler) {
      var handlers = elem.events && elem.events[type]

      if (!handlers) return

      delete handlers[handler.guid]

      for(var any in handlers) return
	  if (elem.removeEventListener)
		elem.removeEventListener(type, elem.handle, false)
	  else if (elem.detachEvent)
		elem.detachEvent("on" + type, elem.handle)

	  delete elem.events[type]


	  for (var any in elem.events) return
	  try {
	    delete elem.handle
	    delete elem.events
	  } catch(e) { // IE
	    elem.removeAttribute("handle")
	    elem.removeAttribute("events")
	}
}

function close_all_bubbles() {
	for(i=0;i<b_visible.length;i++) {
		b_cache[b_visible[i]].style.display = 'none';
	}

	b_visible.length = 0;
}

function switch_bubble(id, e) {
	if(b_cache[id].style.display == 'block') {
		close_all_bubbles();
		b_cache[id].style.display = 'none';
	}
	else {
		close_all_bubbles();
		b_cache[id].style.display = 'block';
		b_visible.push(id);
	}

	evt = (e)? e : window.event;
	evt.cancelBubble = true;
}