function change_img (id) {
	
	$(".big_images").css("display", "none");
	$("#big_image_" + id).css("display", "block");
	
	$(".product_sales").css("display", "none");
	$(".product_sales_price").css("display", "none");
	$("#product_sale_" + id).css("display", "block");
	$("#product_sale_price_" + id).css("display", "block");
	
}