function registerEvents() {
    var link_img_gallery = $$('.link_img_gallery') || '';
    var img_gallery_hide = $$('.img_gallery_hide') || '';
	var zoom = $('zoom') || '';

	if (link_img_gallery) {
		link_img_gallery.each(function(img, i) {
		    img.observe('click', function(e) {
		        e.stop();
		        $('img_zoom').src = img_gallery_hide[i].src;
		        var sc_off = document.viewport.getScrollOffsets();
		        var height_vp = document.viewport.getHeight() + sc_off.top;
		        zoom_height = sc_off.top + 100;
		        zoom.setStyle({ top: zoom_height + 'px' })
		        new Effect.BlindDown('zoom');
		    });
		});
	}
	
	if(zoom) {
	    $('chiudi_zoom').observe('click', function(e) {
	        e.stop();
	        zoom.hide();
	    });
	}
	
}


Event.observe(window, 'load', registerEvents);