session_start

I used to think I knew how to do this ... take pity :) I start my session: session_name("TestALS"); session_start(); I register a variable: session_register("studentid"); if (isset($_SESSION["studentid"])) { $id = $_SESSION["studentid"]; echo "\$studentid= $studentid<br>"; } Pretend $studentid contains something from a previous form. Here is my form with nothing else other than a submit button. But the variable does not get passed unless I add a field. Where did I go wrong? Geez, I know I don't have to repeat a whole bunch of <input type=hidden name=studentid>. That is what a session is for. <form action=this.php> <input type=submit> </form> Should I pass the session id? How? Why does my variable "studentid" NOT get passed after I click submit. Where did I f*** up? Like I said, take pity. I have been reading the FAQ: http://www.php.net/manual/en/ref.session.php And like I also said, I thought I knew how to do this :) John