To use Cascading Style Sheets to force the background image never to scroll, add style= "background-attachment: fixed;" to your opening body tag. This only works in the most recent versions of Netscape and Internet Explorer.
For height, I select a number based on how much content is on the page, because the file will repeat only as long as there is content in the foreground to make it repeat. For average page lengths, 800 pixels is usually sufficient, but you may need to increase that if your page is longer.
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