function start_slideshow(start_frame, end_frame, delay,number_of_slideshow) {
	id[number_of_slideshow] = setTimeout(switch_slides(start_frame,start_frame,end_frame, delay,number_of_slideshow), delay);
}

function switch_slides(frame, start_frame, end_frame, delay,number) {
	return (function() {
		Effect.Fade('slide' + frame+number, { duration: 1.0 });
		if (frame == end_frame) { frame = start_frame; } else { frame = frame + 1; }
		Effect.Appear('slide' + frame+number, { duration: 1.0 });
		if (delay == 1000) { delay = 3000; }
		id = setTimeout(switch_slides(frame, start_frame, end_frame, delay,number), delay);
	})
}

function stop_slideshow(number) {
	clearTimeout(id[number]);
}