you can always center the image with no repeat on a fixed attachment
Code:
<style type="text/css">
body
{background: #000000;
background-image: url('background image to be used, i.e. background.gif');
background-repeat: no-repeat;
background-position: center;
background-attachment: fixed;}
</style>
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TechIMO Folding@home Team #111 - Crunching for the cure!
"my stretched to fit image is too blurry i think i'll stick with duplicated..."
Try creating a larger version of your image. Larger than the max-screensize most people use. (1024x768 is still most popular, but try 1699x1200). If your image is always larger than the screen it should not become blurred.