Nat to web server in internal lan

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I have my web server internal in my LAN
I have another equipment that makes of router and proxy.
The same one is the one that has the public IP and in this I configure
my firewall.
Next I describe the list of rules that I enter to my firewall:

iptables -F
iptables -X
iptables -Z
iptables -t nat -F

iptables -P INPUT ACCEPT
iptables -t nat -P PREROUTING ACCEPT
iptables -t nat -P POSTROUTING ACCEPT

iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j DNAT --to

iptables -A INPUT -i lo -j ACCEPT

iptables -A INPUT -s -i eth1 -j ACCEPT

iptables -t nat -A POSTROUTING -s -o eth0 -j

echo 1 > /proc/sys/net/ipv4/ip_forward

The problem is that if I want to access from internet to my web server,
the firewall not me route to my web server, but rather it is pointing
to the equipment of the firewall.
That I am making bad????      
Thank you.      
Osmar Gerke

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