Sessions Lose Form Field Data When Back Button Used?

I have an old PHP page without sessions. When the user submits the form, and then clicks the browser back button, the prior form data is retained. If I now have that PHP page require another page that uses session_start, when the user submits the form, and then clicks the browser back button, the prior form data is lost. In fact, I noticed that without the session, the web page does not reload from the server and is positioned at the bottom of the page where I left off by the "Submit" form button. With sessions, the page actually reloads from the server, so of course the form fields are empty. Is this normal behavior? Can I have the page not reload from the server? I thought I could pass the buck onto the user's browser setting, but the onus is upon my code. I do not want to modify all my old pages to use this technique for every field http://marc.info/?l=php-general&m=118200948606904&w=2 simply because I want 1 session variable passed around. I even modified my code to check for isset($_SESSION) to not call session_start again, but no joy. Thanks. _________________________________________________________________ http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migration_HM_mini_2G_0507