function shadow_img(i) {
	var img = $('cimg');
	var sh = new Fx.Tween(img, {duration: '10000'});
	sh.addEvents({
		'complete': function() {
			change_img(i);
		}
    });
	sh.start('opacity', '100', '0');
}

function change_img(i) {
	var img = $('cimg');
	if (i + 1 == arr_src.length) {
		i = 0;
	}
	else {
		i++;
	}
	img.src = images_folder+arr_src[i];
	show_img(i);
}

function show_img(i) {
	var img = $('cimg');
	var sho = new Fx.Tween(img, {duration: '10000'});
	sho.addEvents({
		'complete': function() {
			shadow_img(i);
		}
    });
	sho.start('opacity','0','100');
}

window.addEvent('load', function() {
	shadow_img(0);
});