Maintaining source ( client ) ip address

Hi ,

I have received strange requirement of maintaining source ip address
in squid (deployed in transparent mode), such that whenever
destination web server / content server will get the request ( via
squid ), instead of getting squid's ip address, it should get client's
ip address.

Is it possible using squid ? Is there any configuration required in
squid.conf or on network layer ?

My squid box has single network interface accepting /responding to
client's request.

OS is RHEL 4.
Squid version is 2.5 STABLE
Squid is configured in transparent mode.

Thanks in advance !

Best Regards,
Vijay