I am having an issue with certain pages preventing the user from going back to the previous page. The message given by Firefox is: "The page you are trying to view contains PSTDATA that has expired from cache". This happens in the case of an HTML form using the POST method but also a query object in the URL. In this case: index.php?id=shopping_cart in my URL, along with a bunch of form data you carry from page to page in a shopping cart (quantities, what to remove, addresses, payment info, etc...) Is this due to the fact that I am mixing POST and query objects or is it something else? I already tried adding the following but it does not help: header("Cache-Control: no-store, no-cache, must-revalidate"); header("Cache-Control: post-check=0, pre-check=0", false); header("Pragma: no-cache"); Thanks for your help! -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php