Guide: How to use an Arduino as an In System Programmer (ISP)

Hello.
I have to programming a ATmega8 in my own board. I followed the described procedure, but it doesn't work.
avrdude return:
"avrdude: stk500_getsync(): not in sync: resp=0x00"
I tried put 120 ohm resistor VCC to reset: the same result.

Enrico.