Scroll the window by using window.scrollBy : scrollBy « Window « JavaScript Tutorial

<html>
<head>
<title>Window Scroller</title>

<script language="javascript" type="text/javascript">
<!--

function scrollWin()
{
     var y = prompt("Pixels to scroll?","120");
     if (isNaN(y))
        return alert("Numbers only please");
     window.scrollBy(0, y);
}

//-->
</script>

</head>
<body>

<h1>Window Scroller</h1>

<P><a href="javascript:scrollWin()">Scroll Window</a></p>

<P>
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</p>

<P>THE END</p>

</body>
</html>

19.13.scrollBy
	19.13.1.	Scroll the window by using window.scrollBy