Again...Networking, but no internet

I am currently running 3 computers on a wireless lan
(netgear 802.11b). 2 XP (one desktop and one laptop) and
one Win98SE. The connection was working for both network
neighborhood and the internet, till about two days
ago. Now, I cannot browse the internet, but I can
share on the network neighborhood. I ahve reinstalled
the information on the 98SE computer, but to no avail. I
guess it is good that I can see the neighborhood, but no
internet browsing. Oh, and some more information, the
Win98SE machine can see the IP address of all websites,
but will not load and cannot get a ping response.

Any help would be appreciated.

Thanks,

Joe