How much charge passes through a part of a circuit?

[Boxcutter]

Suppose the the two capacitors are charged fully before the switch is closed, how much charge will pass through the switch when we close it?

http://home.student.uu.se/daja8643/elec2.JPG

I've been trying for a long time but I'm lost. All help I could get would be appreciated.

/Daniel

[Hammie]

I would start by considering that the two capacitors really only form one without the switch closed. Can you determine the initial charge?