Projector not working fine

Hi,
I got a laptop with a wide screen and today when I try to connect a projector I got the screen working but 1/3 part of my screen was outside on the projector side.
When I went to the screen settings I told O.SuSE. to have 800x600 on the projector but still keep my normal settings on Screen 1. But that didn’t work so I change 800x600 on both screens and the test pic worked fine but when I shot up my powerpoint in OpenOffice 1/3 part of my presentation was outside the screen.

How do I solve this? I really need a working solution for my presentations I do world wide.

/Christian