Prob with sessions

Hi, How do I add a session variable to this page(index.php), can the form action still be PHP_SELF?: Also there is no password field in the table, interbase will make the connection if the password is correct, how do I capture the password and username in a session variable from the login? <?php if ($login) { $host = 'localhost:C:\test\testdb.gdb'; $connection = ibase_connect($host,$username,$password) or die ("Couldn't connect to server"); echo '<strong>Welcome ' . $username . ', you have logged onto the database: ' .$host . '</strong>'; ibase_close($connection); } else { ?> <form name="form1" method="post" action="<?php echo $PHP_SELF?>"> <input type="text" name="username" > <input type="text" name="password"> <input type="submit" name="login" value="Login"> Thanks.