WannesNaf:
I want to program a ATMEGA328 wich have already a bootloader on it.
... is there somewhere a toturial available?
I already have an arduino UNO but now I want to build a project with the atmega328.
This is 100% the tutorial you need:
see: http://pdp11.byethost12.com/AVR/ArduinoAsProgrammer.htm
The Arduino Uno you have can be configured to work as an ISP programmer for your Atmega328.
The bootloader on the Target AVR is not needed.