1) Add the lines below to the file: /etc/yum.conf

[EL5.2 DVD]
name = Enterprise Linux 5.2 DVD
baseurl=http://10.187.68.68/~fentontravers/el5dvd/Server/
gpgcheck=1
enabled=1

***NOTE: you'll have to have your dvd installed to a webserver like above for this to work. Grab your DVD copy from here:
http://kernel.us.oracle.com/isofs/EnterpriseLinux/EL5/i386/U2
of if you do not have direct access to Oracle's internal network, try getting it from http://linux.oracle.com/

2) rpm --import /usr/share/rhn/RPM-GPG-KEY-oracle

3) yum install -y httpd

4) chkconfig --level 345 httpd on

5) service httpd start

****NOTE: you might have firewalls turned on you can turn them off with:
chkconfig --del iptables
chkconfig --del ip6tables
service iptables stop
service ip6tables stop

or open up ports 80 and 443 (SSL) on them.