var selector = '#subcontainer img';
var fadeDelay = 2500; //Milliseconden - 2,5 seconden
var intervalDelay = 5000; //Milliseconden - 5 seconden

var images;
var index1 = 0;
var index2 = 1;

window.addEvent('load', function() {

	images = $$(selector);
	images.each(function(image,index) {
		image.set('tween', {
			transition: 'quad:in:out', 
			duration: fadeDelay				 
		});
	});
	if(images.length > 1) {
		setInterval('doFade()',intervalDelay);
	}
});

function doFade() {
	images[index1].tween('opacity','1','0');
	images[index2].tween('opacity','0','1');
	index1 = index1 + 1;
	index2 = index2 + 1;
	if(index1 == images.length) {
		index1 = 0;
	}
	if(index2 == images.length) {
		index2 = 0;
	}
}