Problem passing session varable

[Meltdown]

Hi, can anyone tell me how to capture a session url that I can call from any page. I want to make a "BACK" button that calls the saved session url. I can't use REFERER as this is on a VBulletin board.

I set the session url on one page like this:

$SESSION['lasturl'] = "http://".$SERVER['HTTP_HOST']."/".$_SERVER['REQUEST_URI'];

...that works OK as I can echo it on the same page, but when I try to echo it on the next page nothing is printed. This on a VBulletin board so the session_start() is in a global.php file. What am I missing here?

[Meltdown]

Update: When I try to run this script:

<?php
session_start();

$_SESSION['username'] = "dave";

?>

I get this..

Warning: open(/tmp\sess_7be1676b4351982898f492e35b5aaa3a, O_RDWR) failed: No such file or directory (2) in C:\web\session.php on line 2

Warning: open(/tmp\sess_7be1676b4351982898f492e35b5aaa3a, O_RDWR) failed: No such file or directory (2) in Unknown on line 0

Warning: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0

...anyone know what that's all about??

[Meltdown]

Ok, I sorted the "tmp" problem, back to my first problem if anyone has any ideas.

Thanks for any help