note 66093 added to ref.session

I have setup two files as following: test1.php: <?php session_start(); $_SESSION['myds'] = "who is that "; ?> test2.php <?php session_start(); echo $_SESSION['myds'] ; print_r($_SESSION); ?> when i put the test1.php and test2.php in the same directory or put test2.php in the subdirecotry that test1.php resides, the test2.php can print the session values : who is that Array ( [myds] => who is that ). But when i put test2.php in the upper directory that test1.php resides, test2.php CAN'T print the session values , the output as following : Array () My system is Freebsd5.4 , apache 2.2.2 , php5.1.4 Who can give me some suggestions ? thanks. ---- Server IP: 219.239.98.8 Probable Submitter: 219.159.82.241 ---- X-Spam-Status: No, hits=3.1 required=5.0 tests=DATE_MISSING,FROM_NO_LOWER autolearn=no version=2.64 ---- Manual Page -- http://www.php.net/manual/en/ref.session.php Edit -- http://master.php.net/note/edit/66093 Del: integrated -- http://master.php.net/note/delete/66093/integrated Del: useless -- http://master.php.net/note/delete/66093/useless Del: bad code -- http://master.php.net/note/delete/66093/bad+code Del: spam -- http://master.php.net/note/delete/66093/spam Del: non-english -- http://master.php.net/note/delete/66093/non-english Del: in docs -- http://master.php.net/note/delete/66093/in+docs Del: other reasons-- http://master.php.net/note/delete/66093 Reject -- http://master.php.net/note/reject/66093 Search -- http://master.php.net/manage/user-notes.php