Cannot use Session on pressing back

Hi, I am using session_start() and session_register("variablename") . The when I click on the back button from the browser it shows me the following error: "Warning: Page has Expired The page you requested was created using information you submitted in a form. This page is no longer available. As a security precaution, Internet Explorer does not automatically resubmit your information for you. To resubmit your information and view this Web page, click the Refresh button. " How can I remove this. I have used RedHat Linux 7.2 and PHP 4.2.2 with MySQL-Max-3.23.51 You can check it at http://www.eliteral.com/bhost Select appropriately the Datacenter and Os. Configure the package Click Back Button of your browser ===== Best Regards, Monil Chheda(INDIA) http://domains.eliteral.com =========================== =========================== __________________________________________________ Do You Yahoo!? Yahoo! Finance - Get real-time stock quotes http://finance.yahoo.com