Well, Windows 98 does have Internet Connection Sharing available, or you could just do it yourself. Basically if you install two ethernet adapters on the PC that will have the main connection (or one modem and one ethernet adapter if you have dial-up internet service), you can configure one of the adapters (or the modem, if that's your case) to work with your internet service, and configure the other adapter to communicate with your 9 other PC's on the LAN. Once you have verified that this PCcan both surf the 'net, AND talk to its peers on the LAN, configure each of the other 9 PC's (either through the internet connection wizard or the web browser) to use the IP address of the adapter going out to the internet. The Internet Connection Sharing tool will attempt to simplify and automate the process a bit, but I've never used it personally. I have set it up manually several times (just as I described above) for a neighbor of mine who had Comcast Internet. Once would have been enough except that every time he had the comcast techs come out, they undid all the work I had done and when they left he found that only one of his PC's could still get on the net!
On a side note, are you familiar with TCP/IP addressing? If not, you will probably want to try using the Internet Connection Sharing.