// JavaScript Document
var _actual;

	function doAnimation(){
		var showed;
		var next;
		switch(_actual){
			case 1:
				showed = "layer1";
				next = "layer2";
				break;
			case 2:
				showed = "layer2";
				next = "layer3";
				break;
			case 3:
				showed = "layer3";
				next = "layer4";
				break;
			case 4:
				showed = "layer4";
				next = "layer1";
				break;
		}
		_actual++;
		if(_actual == 5){
			_actual = 1;
		}
		$('#'+showed).fadeIn('slow', function(){
			$('#'+next).fadeOut('slow');
		});
		clearTimeout();
		setTimeout("doAnimation();", 1750);
	}