var slideshow = function(){
			/* preloading */
			var images = listaFotos;
			var holder = $('top');
			images.each(function(img,i){ images[i] = img; }); //add dir to images
//			var progress = $('progress');
//			progress.set('text','Cargando...');
			var loader = new Asset.images(images, {
				onComplete: function() {
					var slides = [];
					/* put images into page */
					images.each(function(im) {
						slides.push(new Element('img',{
							src:im,
							width: 669,
							height: 190,
							'class': 'foto-top',
							styles: {
								opacity:0,
								top:0,
								left:0,
								position:'absolute',
								'z-index': 10
							}
						}).inject(holder));
					});
					var showInterval = 5000;
					var index = 0;
//					progress.set('text','');
					(function() {slides[index].tween('opacity',1); }).delay(2000);
					var start = function() {
						(function() {
							holder.addClass('vacio');
							slides[index].fade(0);
							++index;
							index = (slides[index] ? index : 0);
							slides[index].fade(1);
						}).periodical(showInterval);
					};

					/* start the show */
					start();
				}
			});
	}