AutoBuild ant script for Websphere 6

Urgent! I am relatively new to Websphere (have worked on Weblogic before) and am working on an Ant build script for Websphere 6 with the intent to automate the build process (in Unix). The build machine has websphere 6 on it but no RAD. (I do have RAD on my local dev machine though). I don't want any IDE specific stuff in the build script. The more generic it is, the better.

- How do I identify/isolate the websphere specific jars required for building and deploying? (there are like a zillion jars in /lib dir).
- Would appreciate concrete working examples.
- Any tips\suggestions to go about developing this script.
 
Couldn't find any clear documentation on IBM site. Googling pointed me to ejbDeploy.bat but could not find any concrete examples. This must be a common problem for many who use Websphere so someone would have sorted this mess out.

these are the  sites that indicated using ejbDeploy.bat

http://saloon.javaranch.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic&f=46&t=008206 
http://mail-archives.apache.org/mod_mbox/ant-user/200510.mbox/%3CB5D80AEEF599D411AD6100508BEF34D5169FE8AD@kwdmsx11.lgnet.co.uk%3E
http://publib.boulder.ibm.com/infocenter/wasinfo/v6r0/index.jsp?topic=/com.ibm.etools.ejbbatchdeploy.doc/topics/regenc.html

Thanks in advance.