Http forwarding to another internal IP

Hi all,

I've a physical server (Centos 5.4) running several virtual servers (Xen)
My quest is regarding 2 of the servers:
Server1(Virtual):IP: 192.168.15.3 - Centos 5.4 with ISPConfig 3.0.1.6 (not yet installed, though)
Server2Virtual):IP: 192.168.15.8- Ubuntu 9.04 with Apache, Drupal etc

How do i most effiently serve 1 or more web pages on Server2 via Server1 which receives all the request for port 80 behind the router?
I want to avoid installing ISPconfig on Server2 which my friend is gonna be administering.

I've been Googling a lot about this topic today, and found the following:
Use of "Redirect / domain.com" (with domain.com defined as 192.168.15.8 in /etc/hosts on Server1)
Use of mod_rewrite and mod_proxy on Server1

Please ignore the ISPconfig part if it's not familar to you.
That's just an open source ISP control panel

Every answer is much appreciated!
Thank you very much in advance

lots of good stuff here
apache reverse proxy - Google Search

thanks for your answer, i am having similar problem and will look into apache reverse proxy

Works like a charm!!! Thanks a lot!!!
Here is the vhost set up to use reverse proxy:

<VirtualHost *:80>
ServerName yourdomain.com
DocumentRoot /var/www/
ProxyRequests Off

<Proxy *>
Order deny,allow
Allow from all
</Proxy>

ProxyPass / (server-IP)
ProxyPassReverse / (server-IP)
</VirtualHost>