Event.observe(window,'load',function() {
	$$('.image_gallery').each(function(elem) {
		var imgs = $(elem).down('.ig_images').childElements();
		var thumbs = $(elem).down('.ig_thumbs').childElements();
		$(thumbs).each(function(el) {
			$(el).observe('mouseover',function() {
				var idx = $(thumbs).indexOf($(el));
				$(imgs).invoke('hide');
				$(imgs)[idx].show();
			});
		});
	});
});