I am attaching the circuit I used after having received the hint from Paulstreats to use transistors. The resistor values used where both 10KOhm. The transistors where of type 2N3904... (the pic is just how the detector is connected up)
Apologies for the poor illustration, I did it in paint.
Ummm.. Paul, or someone else, could I pick your brains again regarding advice on how to activate the Logitech mouse IR detector/emitter pair. I would much rather use them over the microsoft ones as they have twice as many holes.