I will explain what I done:
1. create a new entry in the code list and call this game code "DVD-R"
2. create an empty code entry in this "DVD-R" game code and call this entry "dummy-code"
3. Boot the ps2 with the AR2, then swap (just regular eject) the AR2 disc with a DVD original larger then the DVDR you trying to boot and wait 20 sec.
4. chose AR codes from the main menu and turn on or off this "dummy-code" before you start the game .
5. chose start game-with codes and press X then it says updating code list and in this exact time press the eject for 2 sec for open the tray with the r-mod chip and swap the original DVD with the DVD-r.
Good luck
NightStalker THANKS FOR YOUR HELP IT WORKED AND MY MATE IS VERY HAPPY INDEED