Order of eth0 & eth1 in SuSE 9.3

Hi, In SuSE 9.2 the on-mother-board ethernet became eth1 *after* I plugged in a pci 3COM ethernet card (which took over the eth0 position). In 9.3 the motherboard ethernet remains eth0 even after I plug in the 2nd network card. I need to make sure that the order of sensing the Network cards is such the the PCI 3COM card is sensed *before* any other network cards. Can anyone tell me how I can achieve this? (or point me to some documentation). TIA, Zoltan