Scheduling multiple start-up/shutdown times

I have been using the Schedule in Energy Saver recently to turn my iBook off at night and wake up in the morning. However, I don't need it or have access to it during school, so I was wondering if there was a way to set multiple start-up/shutdown times like:
Shutdown -- 12:00am
Start-up -- 5:40am
Shutdown -- 9:00am
Start-up -- 4:10pm
I know that I could easily just turn off my computer before I leave, but I'm also interested in the starting-up when I get back.

Any help is appreciated, thanks.