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

var gallery = $$('.galls');
var currentGallery = 0;

if($('prev'),$('next')){
	$('prev').addEvent('click', function(){
		currentGallery --;
		if(currentGallery<0){
			currentGallery=0;
		}
		gallery.setStyle('display', 'none');
		gallery[currentGallery].setStyle('display', 'block');	
		});
		
	$('next').addEvent('click', function(){
		currentGallery ++;
		if(currentGallery>gallery.length-1){
			currentGallery=gallery.length-1;
		}
		gallery.setStyle('display', 'none');
		gallery[currentGallery].setStyle('display', 'block');
		});
}
  
// Chiusura del DOMREADY
});