Iptables and Script to make it possible (Help me please)

Hello i need to to NAT with DNAT and i think SNAT too. this is my lan (attached to a file)

this is my situation

Server Linux running RedHat 9 shrike
with this configuration

eth0 (two aliases)
eth0:0 IP: 192.168.0.1

          NETMASK: 255.255.255.0

eth0:1 IP: 192.168.1.1

          NETMASK: 255.255.255.0

eth1 IP: 10.0.0.1

         NETMASK: 255.0.0.0

ppp0 PPPoE used over eth1 to connect linux server to internet

SERVER W2K

eth0 IP: 192.168.1.100; 192.168.1.101; 192.168.1.102

         NETMASK: 255.255.255.0

LAN: subnet: 192.168.0.0/24

so i want to do NAT over my LAN, it means a client wich ip is 192.168.0.65 for example could have full acces to internet but all incoming packets comes from ppp0 at theses ports 27015 27016 27017 and port 80 have to DNAT to 192.168.1.100 ip address and i guess SNAT too, to my W2k server

i don't know how to do the script to make it possible, could you lend me a hand please.-

Atte.
Guillermo Javier Nardoni
Estudiante de Ing. en Sistemas
Tel: 03402-15540590