<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.4.4.min.js"></script>
<script type="text/javascript">
$(function() {
    var ele   = $('#scroll');
    var speed = 25, scroll = 5, scrolling;
    
    $('#scroll-up').mouseenter(function() {
        // Scroll the element up
        scrolling = window.setInterval(function() {
            ele.scrollTop( ele.scrollTop() - scroll );
        }, speed);
    });
    
    $('#scroll-down').mouseenter(function() {
        // Scroll the element down
        scrolling = window.setInterval(function() {
            ele.scrollTop( ele.scrollTop() + scroll );
        }, speed);
    });
    
    $('#scroll-up, #scroll-down').bind({
        click: function(e) {
            // Prevent the default click action
            e.preventDefault();
        },
        mouseleave: function() {
            if (scrolling) {
                window.clearInterval(scrolling);
                scrolling = false;
            }
        }
    });
});
</script>
<style type="text/css">
<!--
div#scroll {
    width: 200px;
    height: 200px;
    overflow: hidden;
    padding: 4px;
    margin-bottom: 20px;
}
-->
</style>
</head>
<body>

<div id="scroll">
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum</p>
</div>

<a href="#" id="scroll-down">Down</a> - <a href="#" id="scroll-up">Up</a>

</body>
</html>