question squid + firewall + http server inside firewall

[Hanasaki JiJi]

I have the below rules in my firewall.  the http server is inside the 
firewall on  192.168.1.2:80
	people can hit it fine from the outside
	squid is running on the firewall
	inside can browser ouside via squid just fine
	inside cannot browse the outside address

Any thought/input would be appreciated.

# http server
$PROG -t nat -A PREROUTING -i $NIC_EXTERNAL -p tcp \
        -s 0/0 --dport http \
        -j DNAT --to-destination 192.168.1.2:80
$PROG -t mangle -A FORWARD -i $NIC_EXTERNAL -s 0/0 \
        -o $NIC_INTERNAL -d 192.168.1.2 -p tcp --dport http \
        -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
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