2 modems accessing to internet accounts

Hi everyone.

I have Windows 2000, 2 modems and 2 seperate internet accounts. The server is connected to a lan, and i need all pc’s on the lan to be able to access btoh internet accounts on both modems ie:

modem 1 is to dial internet account 1
modem 2 is to dial internet account 2

all machines on the lan need to be able to have access to both accounts and modems

Is this feasable under win2000, or is there other software that can do this (have tried winproxy but it does not work theway I need it.)

cheers

Matt