var imageFunction = function (request, xml){
			img = $('largeimg');
			img.effects({duration: 1000}).start({'opacity':[1,0]}) 
			var response = xml.documentElement;
			$('largeimg').replaceWith(new Asset.image(response.getElementsByTagName("imagepath")[0].firstChild.nodeValue, {id: 'largeimg', title: 'largeimg', onload: $('largeimg').effects({duration: 1000}).start({'opacity':[0,1]})});
			$('caption').setHTML(response.getElementsByTagName("imagecaption")[0].firstChild.nodeValue);
		}