Task Scheduler and notebook Battery event ?

I would like to use Task Scheduler in Vista to launch a script,
IF the laptop changes from A/C power to Battery power.
and I want a second task to monitor when the laptop returns from battery to
A/C power.
I need help, I can not determine what settings to use once I select event as
my triggers.

Can any one help ?

Maybe you should download another software to manage the task.
The Vista software about power only help you to control the LCD'
brightness,some behavior related laptop's states such as closing o
open and so on.
It is not support for you to define the conduct what you want

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batteryboz