Saving data between sessions

Is it possible to save session values between pages? I did a little script
to let the users login. I use this script to check username and password the
user introduces in a form in the main page, index.php.
If a user is found with username and password, than I create
$_SESSION['Login'] and assign it a value of true, else I assign it a value
of false. If a user is non registered, I send it to the proper page to
register, RegistraUtente.php, if he is registered yet, I send him back to
index.php
But here in index.php $_SESSION['Login'] has no value.

Here is the script I wrote:

<?php

session_start();

include("dbconnect.php");

$tabella="table";

$dbname="Zucca";

if (!isset($_SESSION['Login']))

{

$_SESSION['Login']=false;

}

$IdUser=session_id();

$data=date('Y-m-d');

if (!ISSET($HTTP_COOKIE_VARS["PiOnLine"]))

setcookie("PiOnLine",$IdUser,time()+60*60*24*365);

else

$IdUser=$HTTP_COOKIE_VARS["PiOnLine"];

mysql_select_db($dbname,$db);

$username=$_POST["username"];

$password=$_POST["password"];

$query="Select Username, UserPassword from $tabella where
('$password'=UserPassword) and ('$username'=Username)";

$result=mysql_query("$query") or die(mysql_error());

// Se esiste l'utente con username e password allora consenti il login

if (mysql_num_rows($result)==1)

{

$_SESSION['Login']=true;

session_write_close();

$url="index.php";

header ("Location: $url");

}

else // Invia l'utente sulla pagina di registrazione

{

$_SESSION['Login']=false;

session_write_close();

$url="RegistraUtente.php";

header ("Location: $url");

}

?>


Franz

Well, I have solved the problem. In Windows you must specify a directory
where to save sessions. I dind't know that, in Linux I never did it, I
believe it was set by default.

Thanks

Franz