if(document.images) {

	event_off = new Image();
	event_off.src = "images/services/event_off.gif";
	
	event_on = new Image();
	event_on.src = "images/services/event_on.gif";
	
	catering_off = new Image();
	catering_off.src = "images/services/catering_off.gif";
	
	catering_on = new Image();
	catering_on.src = "images/services/catering_on.gif";
	
}