How do I set computer time limits for my kids on Windows XP like I can with Vista 7?

Hello all,

I am looking for an XP equivalent to the Vista/7 Parental Controls Time Limits, specifying hours when a user can be logged onto the machine.

For example, if I want to reserve a couple of hours a day for each kid:
Jill can log on from 1pm to 3pm, but not from 3 to 5.
Jack can log in from 3 to 5 but not between 1 and 3.