Browser back button

Hello, I am sure this has been asked more then a few times but ... I have a web site where almost every page is dynamically created. So if at some point in the site if you hit your browsers back button a popup window occurs and asks if you want to resubmit the data. Upon clicking yes the page is properly displayed. That is a pain in the a$$ and I get many user complaints -- so far I have thought about saving the requested URL and query string in a session variable and loading a back button on every page. This seems to work create if the previous page can be loaded using a GET request but if the previous page was loaded using a HTTP POST it seems I an up the creek with out a paddle :( Any one have any ideas ... Thanks .. -- Michael Gale Network Administrator Utilitran Corporation