Privoxy is a web proxy  with advanced filtering capabilities for 
protecting privacy, modifying web page data, managing cookies, 
controlling access, and removing ads, banners, pop-ups and other 
obnoxious Internet junk. Privoxy has a very flexible configuration 
and can be customized to suit individual needs and tastes. 
Privoxy has application for both stand-alone systems and multi-user 
networks.

Homepage:  http://www.privoxy.org/

Before executing the script, you will need to create 
a privoxy user and group.  To do that, run the following commands:

  /usr/sbin/groupadd -g 206 privoxy
  
  /usr/sbin/useradd -u 206 -g 206 -c "Web Proxy" \
    -d /dev/null -s /bin/false privoxy

(please note that the \ is just to split the command up, the whole 
'useradd' is one line)

To run privoxy at boot, the following code needs to 
be added to /etc/rc.d/rc.local:

 if [ -x /etc/rc.d/rc.privoxy ];  then
     /etc/rc.d/rc.privoxy start
 fi