iCal Between a Imac G4 and a MBP

I have a Imac, and my wife has a MBP, i want to be able to put stuff on iCal on my Imac and she to put stuff on Ical on her MBP and i want to be able to some how be able for them to sync up or show up on the same iCal?? does that make sense?? I want her stuff that she inputs on her MBP to show up on iCal on my iMac... is that possible? I do have a wireless network in my house. Im new at macs, so be gentle please....

thanks!