I am submitting a Username and Password from a login page with a POST form. This sends the user to a homepage. If the user clicks a link on the homepage and then hits the back button to go back to the homepage, the user gets a "Warning: Page has Expired..." message and must hit refresh to resubmit the data. This is annoying for the user to have to do. How can I avoid this page WITHOUT changing the form to GET? If I change it to GET, then the sensitive data (password, etc) will be exposed. Thanks in advance for any help that you can offer.