Trouble sharing DataOne connection

Hi all,

I just got my new adsl connection from bsnl. Modem is as usual connected through an ethernet card. I want to share this connection on the other pc.....which was connected through a cross cable, before I got this connection. I know that I can use an additional ethernet card to share this connection. But I want to share this connection such that I don't have to switch other pc to access the internet, secondly if both the pc's a on they should be able to simultaneously access the net. Is hub a solution of it……I doubt because this is a homeplan any may be multiple user sharing may not be allowed.

Thanks