var total_divs=0; //do not change
var className='counter_holder'; 
$(document).ready(function(){
	$("."+className).attr("id", function (arr) {
		total_divs++;
		return "fade" + (arr+1);
	})
	fadeEngine(0);
});

function fadeEngine(x) {
	var y=x;
	if(x==total_divs) y=1; else y++;
	$("#fade"+x).fadeOut("slow", function() 
		{ $("#fade"+y).fadeIn("slow"); });
	setTimeout('fadeEngine('+y+')',4000);
}