Want to connect a different network through a computer

Hey all, I have another computer (lets name it as computer B) connected to Router to which my pc (lets name it as computer A) is also connected. The computer B is having to network cards and is connected to another different network at the same time. Network 1 is providing internet to both computers and Network 2 is connected to computer B only. Network 2 provides a interface of a machine which can be accessed on computer B by putting a network address 192.168.123.10 in the internet explorer. The network IP addresses are as follows:

My PC (computer A) on Network 1 = 192.168.1.5
Computer B on Network 1= 192.168.1.7
Computer B on Network 2 = 192.168.123.15

Now I describe the problem. I want to access the Network 2 interface (which comes from 192.168.123.10) on My pc (computer A) by sharing Network 2 from computer B. Your replies will be very appreciable.. Thanx