I have 2 pages where i have submit button on 1st page & on 2nd page i have previous button. Both the time i post the data means submit the forms two times. But when i clicked 2nd page's browser back button i get 1 st page with the data but if i click on 1st page's browser back button i get the Warning: Page has Expired. Can any one tell me the solution for? Also i have tried the

header("Expires : Sat, 01 Jan 2000 00:00:00...