var delay = 2000;
var start_frame = 1;

function init() {
  
	end_frame = 4	
	
	new Effect.Appear('img1');
	
	start_slideshow(start_frame, end_frame, delay);	
}



function start_slideshow(start_frame, end_frame, delay) {
	setTimeout(fadeInOut(start_frame,start_frame,end_frame, delay), delay);
}


function fadeInOut(frame, start_frame, end_frame, delay) {
	return (function() {
		
		var img = 'img' + frame

		$(img).style.display = 'none';
	
		if (frame == end_frame) { frame = start_frame; } else { frame++; }
			
		img = 'img' + frame
    
		new Effect.Appear(img);
		
		setTimeout(fadeInOut(frame, start_frame, end_frame, delay), delay + 1850);
	})
	
}


Event.observe(window, 'load', init, false);