What can I do to divide my kids room, I have a 4 year old boy and 2 year old girl, any ideas?

I'm moving and can only afford a two bedroom apartment right now but my kids are a boy and a girl. I've been told they can share a room til one of them turns five, my son will be five in November. I want to put a divider the room is big enough but they like to climb on things and pull things down so anyone have any ideas on what to do?