dnguyen800: DONT do that...
You shouldnt connect a cablemodem to a switch, that way when you share files over your 'domestic' LAN they'll be accessible from the internet...
HomeNetHelp Guide
There are many guides in Internet Sharing on the web, basically if you dont want to use a router (wish will be the best option for sharing internet for several pc's, but its also the most expensive one...), the other way is to make a PC work as a router... ie. having 2 network cards in that PC, one of them connected directly to the cablemodem, and the other one connected to the switch, this way (providing that this PC is powered ON and running a rounting software.. like windows Internet Connection Sharing, ICS) all computers will access the web as if they were THAT PC...
Anyways, I dont think using that setup (cable modem -> switch -> computers), ALL PCs will be able to use the internet, assuming that your ISP only 'gives' you an IP, will only allow the first PC that logs on the network to access the internet...
In not really sure about this.. but that setup isn't the best one for sure..