$q = mysql_query("SELECT * FROM users WHERE user = '$_POST[username]' AND password = '$encrypt'") or die(mysql_error());

            if(!mysql_num_rows($q) == 0)
            {
                $_SESSION['user'] = $_POST['username'];
                echo $_SESSION['user'];
            }
            else
            {
                print 'Couldn\'t log you in, please try again.';
                return;
            }