C128 shaky video

[Sabz5150]

I was given a Neovo SC-19 flat panel monitor... has composite and s-video in (along with DVI/VGA). First thing I thought was a solid replacement for my original C64 monitor. Anywho, I have run into an odd problem: the video is shaky. You can see it move up and down ever so slightly, just enough to annoy the hell out of you. What I am wondering of course is what could be the cause and how can I fix it. Any suggestions would rock. Thanks!

EDIT: I use the Luma/Chroma/Audio cables that came with the C64 along with an adapter to give me the s-video plug needed for the monitor (adapter is built to give Luma and Chroma individual grounds, at least in the adapter).

[thegamezmaster]

You might try Lemon64 website. Just google it. They should be able to help there.