function switch_product_img(divName, totalImgs) {
			for (var i=1; i<=totalImgs; i++) {
				var showDivName = 'photo_' + i;
				var showObj = document.getElementById(showDivName);
				if (showDivName == divName)
				$(showObj).fadeIn(50);
				else
				$(showObj).fadeOut(10);
   				}
				}