Relatively-position your content div within a parent div having overflow:hidden. Make your up/down arrows move the top value of the content div. The following jQuery is untested. Let me know if you require any further assistance with it as a concept.
div.container {
overflow:hidden;
width:200px;
height:200px;
}
div.content {
position:relative;
top:0;
}
<div class="container">
<p>
<a href="enablejs.html" class="up">Up</a> /
<a href="enablejs.html" class="dn">Down</a>
</p>
<div class="content">
<p>Hello World</p>
</div>
</div>
$(function(){
$(".container a.up").bind("click", function(){
var topVal = $(this).parents(".container").find(".content").css("top");
$(this).parents(".container").find(".content").css("top", topVal-10);
});
$(".container a.dn").bind("click", function(){
var topVal = $(this).parents(".container").find(".content").css("top");
$(this).parents(".container").find(".content").css("top", topVal+10);
});
});