Layer 4 switch from IPtables - setup for transparent proxy

[hanasaki]

Any way to use IP tables and squid for a transparent proxy but only for
http.

Basically, the setup for squid and a transparent proxy results in ALL
traffic for a given port (usually 80) going to squid to be proxied.  I
am looking for a way to take any http traffic coming in on Any port and
send it to squid.  Thus http traffic on port 80 or 22 would go to squid
while port 22 ssh traffic would be unaffected.