$(document).ready(function() {
	activ=0
	pilot(1,2); //poczatkowa i koncowa
});

function play(nr,fr,ls){
	$('#box_'+nr).fadeIn(800).delay(2000).fadeOut(400, function(){
		pilot(fr,ls);
	});
}

function pilot(fr,ls){
	if(activ==0 || activ==ls){ 
		activ=fr; 
	}else{
		activ++; 
	}
	play(activ,fr,ls);
}