/*start_slideshow(1, 4, 2000);
    
function start_slideshow(start_frame, end_frame, delay) {
    setTimeout(switch_slides(start_frame,start_frame,end_frame, delay), delay);
}
                            
function switch_slides(frame, start_frame, end_frame, delay) {
    return (function() {
        Effect.Fade('slideshow' + frame);
        if (frame == end_frame) { frame = start_frame; } else { frame = frame + 1; }
            setTimeout("Effect.Appear('slideshow" + frame + "');", 850);
            setTimeout(switch_slides(frame, start_frame, end_frame, delay), delay + 850);
    	}
	)
}
*/

start_slideshow(1, 5, 5000);

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

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

function stop_slideshow() {
    clearTimeout(id);
}