[CentOS] Completeley disabling SELinux?

Hi all,
          I've set SELinux to disabled using the security and firewall 
widget but I'm still getting a lot of messages in Logwatch....

 NULL security context for user, but SELinux in permissive mode, continuing ()

So it looks like SELinux is still operating. Can anyone tell me how to 
turn it off completely? It's my development
server under my desk so I reallly don't care about security.

thanks