PHP Sessions Issue

[kemaltuna]

I am having one hell of a problem that I cannot figure out for the life of me. I have set up a super simple CMS for a client. Each different page of the CMS has and include file called session.php.\[code\]session_start(); $username = $_SESSION['siteadmin'];if (!$_SESSION['siteadmin']){ header( 'Location: login.php?status=2' );} \[/code\]Every now and again, random things would disappear from the database. So, I setup a crude log system that logged any action through the CMS. Well, it happened again. The logs show this:\[code\]Logged in **.**.237.209 17:18 <-- thats meDeleted board member id 12 195.42.102.25 16:49 Deleted board member id 15 195.42.102.25 16:49 Deleted board member id 8 195.42.102.25 16:49 Deleted board member id 10 195.42.102.25 16:49 Deleted board member id 9 195.42.102.25 16:49 Deleted board member id 4 195.42.102.25 16:49 Deleted board member id 3 195.42.102.25 16:49 Deleted board member id 5 195.42.102.25 16:49 Deleted board member id 6 195.42.102.25 16:49 Deleted board member id 11 195.42.102.25 16:49 Deleted board member id 7 195.42.102.25 16:49 Deleted review id 2 195.42.102.25 16:49 Deleted review id 3 195.42.102.25 16:49\[/code\]and that goes on for a couple pages. It doesn't even show 195.42.102.25 logging in! Last time it happened with 195.128.18.19. How are they computers loading the window without a session variable? Is there a security hole in my code that I am completely overlooking?!Any insight on this issue would be awesome.Thanks,