Session problem in PHP4.0.3pl1

Hello everyone! I've got a new problem now. When I call the session_start() function it creates a new session id for the current session when a user logs into my site. However, on the next page the user goes to I call session_start() again as normal, BUT for some reason it gives the user a new session id. I don't have a clue as to why it's doing this and I've tried several things. I've tried: session_id($SID); session_start(); I tried this to over ride the new session id that session_start() creates (the $SID is passed through the URL throughout the enitre site after a user logs on). This doesn't work and it still creates a new session id. This creates a huge problem because I'm not using cookies just the files that php creates in the /tmp directory. What I'm finding is that all my user session variables are being set to one of these files but with the session_start() always giving the user a new session id I lose these session variables. This is very frustrating and I was wondering if anyone had the same problem and what did you do? Any suggestions on how to keep the same session id throughout the site so php won't create a new one everytime session_start() is called (FYI it even creates a new session id if you don't use session_start() but instead use session_register() when you register your variables). Anyway, thanks for any help you can offer! :) Jay Paulson