Jagged camera pannng

Hi
I have an issue with camera panning.
I have setup a plane with an image as texture. I need to have a camera panning from left to right the image. The resulting video is jagged. I mean one can see stepping from frame to frame whatever the frame /s I select or the highest resolution with YafRay…
I have two samples on my web site:http://www.ybdigitals.com/Blender/test.htm
Does somebody could help with smooting the capture in a way? I want to have a smooth panning of the image…
thanks
Yves