wireless internet sharing between Debian and a pda

Hi folks!
I'm running a Debian 3.1, and I've just installed and configured a Wifi Card (Motorola wn825g) as Ad-Hoc to share my internet connexion with my PDA.
my debian box is connected trought eth0 which is wired and proxied (<- it's a residential connexion) , my Wifi's interface is wlan0.
I've typed an "ifconfig wlan0 192.168.1.1" and I put on my PDA "192.168.1.2" as ip adress and "192.168.1.1" as gateway.
When I ping my PDA from my Debian box , it works.
From my PDA I can type on the browser "http://192.168.1.1" so I can check my website (on my laptop) and it works.
But unfortunately nothing else works on my PDA, so it's still not connected:???:
I've googled several keywords and I've learned that an iptable command can solve this problem.
I've tried: "iptables -t nat -A POSTROUTING -o eth0 -s 192.168.1.0/2 -j MASQUERADE"
but nothing happens.

I would appreciate your help guys ! :)
thank you for giving me some of your precious time.

Type this into a shell on the laptop:

/sbin/sysctl net.ipv4.ip_forward

That will query a kernel variable that must be set to 1 for forwarding to work, i.e. routing.
If it's 0, you need to edit /etc/sysctl.conf to add/edit a line:

net.ipv4.ip_forward = 1

Also, to set it immediately, I think this works (as root):
echo 1 > /proc/sys/net/ipv4/ip_forward

You probably have your routing table setup correctly if the laptop and PDA can ping each other.