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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  <a onclick="myscroll(850)">Next</a>
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  <a onclick="myscroll(1800)">Next2</a>
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  <a onclick="myscroll(2000)">Next3</a>
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  END
</body>
</html>
 
function myscroll(i)
{
    if (document.elementBody.scrollTop + window.innerHeight > document.elementBody.scrollHeight - 50)
    {
        document.elementBody.scrollTop += 1;
        if (document.elementBody.scrollTop + window.innerHeight < document.elementBody.scrollHeight)
            setTimeout(function() { myscroll(i) }, 10);
    }
    else if (document.elementBody.scrollTop < i - 100)
    {
        document.elementBody.scrollTop += 10;
        if (document.elementBody.scrollTop + window.innerHeight < document.body.scrollHeight)
            setTimeout(function() { myscroll(i) }, 10);
    }
    else if (document.body.scrollTop < i - 50)
    {
        document.body.scrollTop += 5;
        if (document.body.scrollTop + window.innerHeight < document.body.scrollHeight)
            setTimeout(function() { myscroll(i) }, 10);
    }
    else if (document.body.scrollTop < i)
    {
        document.body.scrollTop += 1;
        if (document.body.scrollTop + window.innerHeight < document.body.scrollHeight)
            setTimeout(function() { myscroll(i) }, 10);
    }
}
​
Output

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