first, scuse me for the long time passed before my response (I was in exams;-)
well, I've commented this line out but the result didn't change.
Don't have any idea.
I explain again my problem :
I've got this line in my config:
Option "MetaModes" "1024x768,1024x768;1024x768,NULL"
but when I switch on the second metamodes and when I move my mouse to the right, my screen moves. My screen is not limited to 1024...so the applications are limited to half a screen.
if someone have an idea, I will be happy.