Use background-attachment:scroll to scroll a background image when the user scrolls the content. This is the default value.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<style type="text/css">
* .bg-ry {
background-attachment: scroll;
background-position: center top;
width: 300px;
height: 300px;
background-image: url(http://www.java2s.com/style/logo.png);
}
</style>
</head>
<body>
<p><div class="bg-ry">Background image repeat-y →</div></p>
</body>
</html>
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