session ไม่ทำงานครับ PHP Version 5.2.17 รบกวนดูโค๊ดให้หน่อยครับ

$user = $_POST["user"];
	$pass = $_POST["pass"];

		if ($user == "doc" && $pass == "1234"){
				session_start();
				session_register("sess_adminid");
				$sess_adminid = session_id();
				echo "<meta http-equiv=\"refresh\" content=\"0;URL=filename.php?manager=home\" />";
		}else{
				$code_error = "<Font color=\"red\">Invalid Username/Password</font>";
				session_register ("code_error");
				echo "<meta http-equiv=\"refresh\" content=\"0;URL=filename.php?option=manage\" />";
		}