I did not find any device driver software for an internal WiFi card for this laptop on the HP driver download page.
And no mention of WiFi in the Startup or Reference guide.
You could try a USB WiFi adapter - just make sure it's one that will work with USB 1.0 which is what I think your laptop uses.
Example: Belkin F5D7050
Under the Features heading it says: Fits any standard 1.0, 1.1 and 2.0 USB slotBelkin F5D7050 Wireless-G 54Mbps USB Network Adapter @ Walmart