function startGalleryRotation(selector,delay){ 

	var i = 0; 
	var layers = $$(selector); 
	delay = (delay == undefined) ? 6000 : delay; 
	
	setInterval(function(){ 
	
		layers[i].fade('out'); 
		
		i = (i == layers.length-1) ? 0 : i + 1; 
		
		layers[i].fade('in'); 
		
	},delay); 
}