Shaking Picture (using ultra key)

I am using ultra-key for a grey frame. In that frame I have clips (mpg, m2v), animations (mpg) and pictures (jpeg).
The frame is made with photoshop -> JPEG
the border of the frame is unsharp and it seems to go back and forth.
output:
NTSC, 720*540, 25 fps, Quality 5,
top MPEG, 384 kbit/s, 48khz, 16bit, stereo
VBR, 1-Pass, min 4.00, target 15.00, max 18.50
Adobe Premiere Pro CS 5.0
how can I stop that shaking?
thank you.
Philipp
look closely, you will see it

What encoder are you using--Adobe Media Encoder? You have unusual settings that I am unable to duplicate.
Also, it appears that all the elements, and not just the frame are jittering. You wrote that you are using the NTSC standard
but your settings are more indicative of a PAL project. Try re-encoding using either standard PAL or NTSC frame size settings.
You may also need to change the field order.

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http://fredhunsberger.com/people/White%20Noise%20Mess.jpg
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Thanks UlfLaursen for trying to help! UlfLaursen
Wow, I don't know how to phrase my question!
So here it is in pictures:
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Not too bad for my first green screen! It's not perfect but pretty good.
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Here Some Details:
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Shaking Picture (using ultra key)

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