var previews = new Array;
	
	window.addEvent('load', function() {
			previews = $$('div.gallery_preview');
			for (var i = 1; i < previews.length; i++) previews[i].fade('hide');
		}
	);

	function changeImage(div_old,div_new)
	{
		if (previews[div_old] && previews[div_new])
		{
			var myFx = new Fx.Tween($(previews[div_old]), {property: 'opacity'});
			var myFx2 = new Fx.Tween($(previews[div_new]), {property: 'opacity'});
			myFx.start(1,0).chain( 
				function() { 
					previews[div_old].style.display = 'none';
					previews[div_new].style.display = '';
					myFx2.start(0,1);
				}
			);
		}
	}