CSS Floating Image

Ever wonder how it is done ? Well heres the code. a picture at the top right will always stay there no matter how you scroll the page.

<style type="text/css">
<!--
body
{
  background-attachment: fixed;
  background-image: url;
  background-repeat: no-repeat;
  background-position: right top;
}
-->
</style>

change the url with the correct image filename you want to appear.