starting squid automatically as a different user

[Umang Natani,NM Chennai]

Hi all,
I am running squid on my redhat Linux 5.0 box. But everytime I have to run
it manually whenever i start up the machine. What should i do so that it
will run automatically as soon as i start up the machine with a user
different than the root. As i tried to run it by putting some commands in
rc.local file but it gave errors regarding running squid as a root. So what
needs to be done so that squid will run as a different  user at the time of
boot-up. 

Umang