session var being lost between pages

Ok, newbie I am but ... I seem to be losing my session vars when I load up a different php page. My set-up: 1- main page starts session and logs user in if (isset($PHPSESSID)) session_start($PHPSESSID); else session_start(); $PHPSESSID = session_id();

$SID       = "PHPSESSID=$PHPSESSID";

if(!isset($userid)) { login_form(); exit; } else { session_register("userid", "userpassword"); } Once the user is logged in I have no problem accessin the vars $userid and $userpassword. On the page I even have an <A HREF> link to second php page and the vars are accessible there also. However this other page has a form. When the user submits the form, a third php page is loaded. On this third page the vars no longer have any values. Why is this? How can I access the vars from this third page? Thanks! Jc _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp