[CentOS] Missing In PATH

I'm a newb to linux so please be patient. Running CentOS 4. Using Bash. I'm not sure what happened, but now for some reason /sbin, /usr/sbin, and /usr/local/sbin are all missing from the path. I am su'd as root. I've tried several different methods to put this back including:

PATH="/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/hom e/cholland/bin:/sbin:/usr/sbin:/usr/local/sbin"

export PATH=$PATH:/sbin export PATH=$PATH:/usr/sbin export PATH=$PATH:/usr/local/sbin

All of these do add the directories to the path until I logout and log back in. Then they are gone again. Any help would be greatly appreciated.

Thanks Cody