function thumbnail_click_handler()
{
	var objTarget = $("photo_target");
	if (objTarget) {
		objTarget.src = this.src;
	}
}

// Require that Prototype is available
if (typeof Prototype != "undefined") {
	document.observe("dom:loaded", function() {
		var thumbnails = $$("img.photo_clickable");
		
		for (var i = 0; i < thumbnails.length; i++) {
			thumbnails[i].observe("click", thumbnail_click_handler);
			thumbnails[i].style.cursor = "pointer";
		}
	});
}