Connecting a internet lan to home lan

Hello,

i have two pc and a laptop. pc1 and laptop r connected to a router (wifi linksys) .i dunt have dsl connection yet.
however on my other pc2 has internet access. it is connected by a lan and it used firewal to connect to access network. so for time being i want to use internet on all pcs and laptop.

specs

ps1 192.168.1.101 set by router
laptop 192.168.1.102 set by router
linksys router 192.168.1.1

pc2 First Lan card config
192.165.0.57
server ip 192.165.0.5
uses microsoft firewal client for ISA server 2004
conneted to 192.165.0.57

pc2 second Lan card config
192.168.1.103 set by router


now can anyone help me to use interent on all computers ?

can u i just connect internet cable to dsl port of router ? and it will set ip automatically ?????

or i just have to share internet on pc2 and used some kind of proxy server etc to access internet from laptop ????


by the way i am using xp sp2 on all machines :)