AVR-Chat

Hi, 
I use Ponyprog and the parallel programmer of the Ponyprog page,
I've started to use the Atmega128 and i wanted to use a cystal 
oscilator, so i've tried to program the fusebits, in ponyprog i've 
make a reading of the fusebits, changed the CKOPT and the CKSEL, after 
that i make a write.. 
Now the problem, after that i've can not read or write the ATmega, 
what it i do wrong? 
I've tried t scope the pins and the MISO pin (PE1) is always at 1.