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hi phpfreaks

Recently I tryed to create a login for my website and a logout using sessions.
The problem I have is: Whenever I log in I will be going to the homepage of the website. My session will be set and everything works fine. Now when I log out my session will be unset and destroyed. The problem is, is that whenever I go back in history I can still see my homepage. When I refresh that page the browser asks the user to resend it's information (probably because it has to do with using post in my login template).

b.t.w. is it a bad thing to use request and a .htaccess file for my login form?

So whenever a user logs in -> logs out -> goes back in history -> refreshes -> resend information
the user is not asked to answer any account and password information to get itself logged in again.

This troubles me for quite a while now !

Here are the pages I use to login, logout and show the homepage:

Login.php:
Code: [Select]
<?php
  class Handler_Login extends Action_Handler
  {
      function __construct($action_handle)
      {
        parent::construct($action_handle);
        $this->action = $action_handle;
      }
       function secured_handler()
       {
           if ($this->session->check_session() == false)
           {
              $password = $_POST['password'];
              $username = $_POST['username'];
              $login = $this->dbh->Login($username, $password);
              if ($login == true)
              {
                  $this->session->set('username', $username);
                  $this->view->displayHome();
                  $this->view->display();
              }
              else
              {
                  echo "you are not logged in";
              }
           }
           else
           {
               $this->view->displayHome();
               $this->view->display();
           }

       }
  }
?>
Logout.php:
Code: [Select]
<?php
    class Handler_Loguit extends Action_Handler
  {
      function __construct($action_handle)
      {
        parent::construct($action_handle);
        $this->action = $action_handle;
      }
       function secured_handler()
       {
           $this->session->stopSession();
           $this->view->displayLogin();
           $this->view->display();
       }
  }
?>

Home.php:
Code: [Select]
<?php
  class Handler_home extends Action_Handler
  {
        public function __construct($action_handle)
       {
           parent::construct($action_handle);
           $this->action = $action_handle;
       }
       function secured_handler()
       {
          if ($this->session->check_session() == false)
          {
              $this->view->displayLogin();
              $this->view->display();
          }
          else
          {
              $this->view->displayHome();
              $this->view->display();
          }
       }
  }
?>

Session.php:
Code: [Select]
<?php
    class Session
    {
         function __construct()
         {
             if(!isset($_SESSION))
             {
                session_start();
             }
         }
         function set($name, $value)
         {
             $_SESSION[$name] = $value;
         }

         function get($name)
         {
             return $_SESSION[$name];
         }

         function stopSession()
         {
             unset($_SESSION);
             session_destroy();
         }

         function check_session()
         {
             if(isset($_SESSION['username']) && !empty($_SESSION['username']))
             {
                return true;
             }
             else
             {
                return false;
             }
        }
    }
?>
view.php:
Code: [Select]
<?php
      class view
      {
        private $tpl;
        function __construct()
        {

        }

        function displayStatus()
        {
            $status = file_get_contents("templates/status.tpl");
            $this->tpl = str_replace("%content%", $status, $this->tpl);
        }

        function displayLogin()
        {
            $this->tpl = file_get_contents("templates/login.tpl");
        }

        function displayHome()
        {
            $this->tpl = file_get_contents("templates/home.tpl");
        }

        function display()
        {
            echo $this->tpl;
        }
      }
?>

now what I'm trying to do is: whenever the user goes back in history after being logged out, the page should be redirected to the login page. I have no idea how I would accomplish this.
I know it has got something to do with my login.php but I can't really make it redirect to itself since it will then most possibly start an endless loop of redirecting.

I'm using templates to display my pages, if neccesary I will post them too,
Thanks for your support and I hope this issue will get solved