Wireless Accespoint, Bridge and routing

Hello all,

For my Christmas project this year I'm trying to setup a Linux box which
will replace a crap broadband router and wireless access point. I've
purchased a Conexant based PCI ADSL card and have that working
perfectly. Tonight I will get my hands on a Netgear WG311 PCI wireless
network card and will follow the guide at
http://gentoo-wiki.com/HOWTO_Buildin...nt_With_Gentoo
to get it working.

The physical network will look like this:

Desktop <-----> eth0 - Linux Box - ppp0 <-----> Internet
|
wlan0
|
|
Laptop

Getting ahead of my self a bit if I bridge the wired Ethernet port
(eth0) to the wireless lan (wlan0 ??), as detailed in the How-To, so my
laptop can see my desktop PC on the same subnet. How do I setup iptables
to forward the required packets out on the Internet via ppp0.

Many thanks for any help and Merry Christmas
Ryan