Hi there I need some help.

I am looking for a way to automaticly respond to incomming bitcoins into my bitcoin client.
As soon as someone sends me bitcoins and I recieve them on my client I would like the client do this:

1. The client must be able to recognice incoming bitcoins
2. Identify the address from which the bitcoins were send
3. Send the minimum possible ammount back to this address which a massag attached for example "thank you"

Is this possible to do over the Bitcoin-RPC-Konsole or do I need to get some script running? Which would be the easyies way.
thanks for responds