Have a linux box, want it locked down but just be able to surf internet on it. Why is this script blocking http too?

#!/bin/sh
#
#
iptables -F

#
#Set default policies for INPUT, FORWARD and OUTPUT chains
#
iptables -P INPUT DROP                
iptables -P FORWARD DROP
iptables -P OUTPUT DROP

#
# Allow TCP connections on tcp port 80
#
iptables -A INPUT -i eth0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -o eth0 -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT

#
# Set access for localhost
#
iptables -A INPUT -i lo -j ACCEPT


#
# List rules
#
iptables -L -v