DFrobot Relay shield problem

Hi,

I am using the dfrobot relay shield on my Arduino.
I know how to program the arduino itself to speak to the shield but i need to make it work on a mouseclick from processing.
Probably a really noob question but i dont seem to be able to figure it out.

This is basicly what i want.
When the mouse is clicked i want no1 and com1 to connect.
And at the same time to have no2 and com 2 open.

Thanks in advance.