Installscript Code to modify Tomcat Context.xml to ad Data Source

Hi,
I am facing a problem while modifying the context.xml in Tomcat7/Conf folder through Installshild..

I m trying with FileGrpe then InsertFile but no result..

I need to add the Datasource string Before </Context Tag>


Please need your help, also for a War deployement process through Installshild in Tomcat 7.


Please reply asap..

Thanks in Advance..
Devidutta Panda
Mumbai,India