Enable PITR in Postgresql

Dear all,

Today I need to enable PITR in my Postgres Production Server.
I followed the below links for this purpose :

http://scale-out-blog.blogspot.com/2009/02/simple-ha-with-postgresql-point-in-time.html
http://www.postgresql.org/docs/8.3/static/continuous-archiving.html

But I am confused about the below line , do we manually write the name
of each file to archive in the archive directory :

I have just installed PostgresPlus-8.4 and load some data in the demo
server and at present there is only one file name
(000000010000000000000000) and archive_status directory is empty.
Now do we need to change the below command each time new log file is
created or there is some standard way to do that.

|archive_command = 'cp -v %p /data/pgsql/archives/%f'

Thanks
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