Optiplex Gx110 Ethernet Issue Help!!

I have a second-hand Optiplex Gx110 and I have no resource cd for this system. Anyways I formatted my system with a Windows 98se cd i got from a friend. But now i cant find the driver for my ethernet thing. Ive tried everything downloading the drivers off of dell's site and going to 3com's site to try and find it. But nothing worked! If anyone can help me it would be greatly apprecaited. I took the numbers down off the chip and here they are 3com 920-BRO6 , 3com 40-0579-006, 55409 CS0120 P17, and Broadcom 5904. Any help would be apreciated.