redirect and come back of my navigator

[eluser]toopay[/eluser]
@MrAmine
Try this :
1. Go to www.facebook.com (if you've already login, log out first).
2. Fill out username & password, click login.
3. Now you should in 'Home' page. Click 'Back', and i bet you'll be back at login form (even in the actual state, you're already login).

What you expect to hapenned?! I told you, the browser fetch the page from its cache, without interacting with the server at all! Its browser mechanism, which nothing to do with your code AT ALL! You will face the same condition in ANY SITE!