I want to share an internet Connection between two computers by a crossover

I want to share an internet Connection between two computers by a crossover Cable,I alredy have a NIC Inbuilt in my PC’s Motherboard .An ethernet Cable is connected to router from that port ,Can i Configure another NIC Card in my PC to Attach Another Computer By a Crossover Cable.please provide me the solution ,I am puzzled.MY Oerating system is Window XP.& other also is same.