newbie: stuck at deploying whenever via cap


im trying to deploy whenver + multistaging via cap:
this is my task
run "cd #{release_path} && whenever --set environment=#{rails_env}
--update-crontab #{application}_#{rails_env}"

1)why i do append rails_env to --update-crontab? because i would like
to have 2 sets of cronjobs, one for each stage (staging & production).
problem is that a deploy (eg proeduction) generates 2 sets of jobs,
which have the identifier:
- applicationname
- applicationname_production

why is this?

2) if im doing simething fundamental wring here, pls enlight me

could anyone pls shed osme light on this? thx

this is rails 2.3.x