if (document.images) {	

  	events_on= new Image();			events_on.src="images/events2.gif";  
	events_off= new Image(); 		events_off.src="images/events1.gif";

  	archives_on= new Image();		archives_on.src="images/subscription2.gif";  
	archives_off= new Image(); 		archives_off.src="images/subscription1.gif";

  	webcast_on= new Image();		webcast_on.src="images/webcast2.gif";  
	webcast_off= new Image(); 		webcast_off.src="images/webcast1.gif";

   }