[CentOS] network config files in centos 5 changing

What is happening in centos 5 with network config files???

I have a machine with 2 network cards.

ifcfg-eth1 keeps changing to DHCP. All my static setup is gone.

Why is it doing this? How can I stop it?

I run "netconfig -d eth1" and re-setup my static information. I reboot and
now I am back to DHCP.

I have a gigabyte motherboard, nvidia chipset. forcedeth driver. eth0 is 
e1000.

Jerry