Code:
<script>
//path to image file
var watermark = 'pix/back.jpg';
//I.E or NS6
if (document.all||document.getElementById)
document.body.style.background="url(watermark) white center no-repeat fixed"
</script>
you can use the above sccript to make a backround image appear static like a watermark on your page, just change 'watermark' to the location of your image.

You can make the image faded with your graphics software, or post it here and I'll oblige(thats if you don't know how)