kimio, this sems to work with an Arduino NG. The pinout is exactly the same so no changes needed.
I don't have any blank ATm168 (only a spare one with the bootloader already burned) so I haven't yet tried to upload the bootloader, but the first tests are ok, avrdude-serjtag returns 0x1e9406.
Thanks a lot man, now I can finally write any ATm168 with the Arduino only ^^