Automatic and scripted installation process of Jahia

Hi,

I want to build Ant scripts to build very quickly  new Jahia server to 
developments integration and tests (development and quality process).
I'm using Ant for that purpose, to build multiple Tomcat servers on 
different listening ports, no problems.

I want to deploy Jahia on the new Tomcat instance, using indications 
from the FAQ : http://www.jahia.org/jahia/Jahia/devzone/pid/454#15.
But I want to bypass the configuration wizard laucnhed at the first 
Jahia run.

So, how do I have  pre-configure the Jahia server (I know my database 
parameters, listening ports, ...) ?
Do I have to modify only the jahia.properties or are there any other 
paemeters to put somewhere else ?


Thank's a lot.