How to share the internet connection ??

Hi Digitians,

There's a system with windows 2003 server OS, and 2 lan cards, LAN1 has the purchased statics public ip 59.144.47.XXX

senario :-

LAN1 LAN2

ip - 59.144.47.XXX ip - 192.168.100.1
subnet mask- 255.0.0.0 subnet mask- 255.0.0.0
gateway- 59.144.47.1

From DSL modem, LAN1 is connected and from LAN2 a D-link 24 port switch is connected, and from the switch 10 computers are connected. All the 10 computers have static ip address as shown below.

computer1 192.168.100.2
computer2 192.168.100.3
computer3 192.168.100.4
.
.
.
computer10 192.168.100.5

but iam not able to get the net connection in these 10 systems, what do i need to do ??

Thanks for your help.