iptables and 2.4.1

[spent187 <spent187@home.com>]

(i hope this posts properly)

I am relatively new to linux, and have recently upgraded to woody, and 
the 2.4.1 kernel.  But now my ip masq'ing doesn't work.  This is what I 
had in 2.2.18pre with potato:

echo -n "Starting IP masquerading... "
echo "1" > /proc/sys/net/ipv4/ip_forward

ipchains -A forward -s 192.168.0.2 -d 192.168.0.2 -j ACCEPT
ipchains -A forward -s 24.141.108.59 -d 0/0 -j ACCEPT
ipchains -A forward -s 192.168.0.2 -d 0/0 -j MASQ

That worked fine.  But with 2.4.1 I understand I must use iptables, but 
I don't know what I have to change in my script...  Could someone please 
point out my stupidity and help me out here? 

Thanks...