NICs changing names by themselves?

I have a box with 2 NICs in it. SuSE 9.2 Pro. One Realtek that starts up as eth0, and a Broadcom that starts up as eth1. So far, so good. But suddenly after a reboot, they've changed places? The Realtek is then eth1 and the Broadcom is eth0. A couple of reboots later, they've changed places again! How can I control this? I need static naming since I have apps that depends on the correct name/network. Anders.