Buy on Amazon : http://www.amazon.com/gp/product/B0000646PL?tag=catfoodrevi0a-20

Siemens SpeedStream Wireless USB Adapter (SS1022)

Wireless connectivity up to 11 Mbps
Installs without opening PC
USB-powered--needs no external power supply
Easily integrates with other manufacturers 80211b compliant devices
Compatible with Windows 98 98SE 2000 Me XP