Hi, sorry for responding in English. I hope you understand it, or someone can translate.
The automatic reset needs both a Diecimila and Arduino 0009. It will not work with Arduino 0009 and an unmodified NG or BT board. The Diecimila has a capacitor connecting the DTR line from the FTDI chip to the reset line of the ATmega168. The 0009 software sets this DTR line appropriately. You can, on an NG, solder this capacitor in place, after which the automatic reset will work.