var slideshows = function (){
	/* settings */
	var slideshows = $$('.slideshow');
	slideshows.each(function(container){
		var images = container.getElements('img');
		if (container.getProperty('rel')){
			var showDuration = container.getProperty('rel') * 1;
		}else{
			var showDuration = 4000;
		}
		var currentIndex = 0;
		var interval;
		/* opacity and fade */
		images.each(function(img,i){ 
			if(i > 0) {
				img.set('opacity', 0);
			}
		});
		/* worker */
		var show = function() {
			images[currentIndex].fade('out');
			images[currentIndex = currentIndex < images.length - 1 ? currentIndex+1 : 0].fade('in');
		};
		/* start once the page is finished loading */
		window.addEvent('load',function(){
			interval = show.periodical(showDuration);
		});
	});
}

window.addEvent('domready', function(){
	slideshows();
});