Mark,
By default images that are used for backgrounds will tile.
The best way to control this is with css. Insert the script between your Heading Tags. ( <Head> -----------</Head> )
<style type="text/css">
<!--
body {background-image: url(folder/filename.jpg); background-repeat: no-repeat}
-->
</style>
Replace the "folder" with your folder name and replace the "filename.jpg with your file name
This will stop the image from tiling, but my gut hunch is, it will not have the desired effect you are looking for.
For more detailed information on controlling images with CSS, you can review this page:
http://www.elated.com/tutorials/authoring/css/backgrounds/
