This is the same question to the one previously posted - only slightly differently named... but...
Yes its possible. The "how" depends on what operating system you're using. Also you'll need another network card for the ICS (Internet Connection Sharing) machine and a hub to connect them all together.
The following link will take you to a site that will describe setting it up in detail...
http://www.internet-sharing.com/
(remove spaces in the above URL)
...but to add to that, I recently set up ICS using a Win98se machine and it would not work! Internet Connection Sharing for Win98 machines with multiple network cards is very dodgy and many many users report that it doesn't work for them. And they're right!
In the end I used a free tool downloadable from the web called RASPPPOE that makes your connection look like a superfast dial-up connection...
...which does work very well for ICS on Win98 machines. I've had no trouble with that method and happily recommend it toanyone who cant make ICS work on Win98.
Good luck,
Tim.