Sharing network using second lan card..

I have 2 different internet connections coming through the same CAT5 cable. I just need to change my IP to switch between my connections and my ISP's.
Is it possible to share my network between 2 PC's so that I can configure each PC for one ISP, using their respective IP series ? I have already connected my pc's using a crossover cable (using 2 lan cards in one of the pc).

Essentially is it possible for the PC having 2 LAN cards to act as a simple switch or a hub to pass on the network from 1 LAN card to other so ican use both my connections simultaneously ?
 
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