You have to add rule to firewall to allow the nated packets to be allowed on FORWARD chain
Code:
iptables -A FORWARD -p tcp -i eth1 -o eth0 -d 192.168.10.10 --dport 80 --sport 1024:65535 -m state –state NEW -j ACCEPT
iptables -A FORWARD -t filter -o eth1 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -t filter -i eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT