broadband modem with wireless router

[RYU81]

I have broadband modem Wi-Fi model Motorola,I need best setting with linksys model WRT54G2 V1(wireless router) because my modem not support wireless I need to do this like in this pic:

my modem give me IP for default gateway 192.168.15.1

what i need now setting in wireless router(linksys)

I upload page for setting for router.

http://www.speedyshare.com/372972304.html

P.S:

broadband modem pic

[RYU81]

nope my modem have only WIFI from outside to get internet from company