sessions are giving me a headache

[edal11]

I have the following functions:

function register_session( $user, $pwd )
 {
    session_start();
    $_SESSION['username'] = $_user;
    $_SESSION['password'] = $pwd;
    $_SESSION['ip'] = $_SERVER['REMOTE_ADDR'];
 }

 function session_logged()
 {
     session_start();
     if( isset( $_SESSION['username'] ) && 
         isset( $_SESSION['password'] ) &&
         $_SESSION['ip'] == $_SERVER['REMOTE_ADDR'] )
         return true;
     else
         return false;
 }

I'm trying to make it work with register_globals off.
I've already changed session.save_path = c:\windows\temp\

On every page I do the following:

if( session_logged )
{
... code here
}
else
{
die( 'you are not logged');
}

But when I run this code ( the session_logged function ) I get the following errors:

Warning: Undefined index: username in c:...\class.session.php on line 121

Warning: Undefined index: password in c:...\class.session.php on line 122

Warning: Undefined index: ip in c:...\class.session.php on line 123

Does anybody knows the problem?? 😕

[planetsim]

umm.. can you show use those lines im expecting them to be these lines

$SESSION['username'] = $user;
$SESSION['password'] = $pwd;
$SESSION['ip'] = $_SERVER['REMOTE_ADDR'];

if so.. you are making all this session stuff without out registering one.