pshcolnyy,
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
#obolochka {
position: relative;
margin: 0px auto;
border: 2px solid black;
width: 500px;
height: 350px;
overflow: hidden;
}
#telo {
position: absolute;
width: 500px;
height: 300px;
overflow: hidden;
outline: 2px solid red;
top:0px;
background: rgba(255, 255, 255, 1);
}
#knopka {
bottom: 0px;
height: 50px;
width: 50px;
margin: 300px auto;
}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script>
$(function()
{
$("#knopka").click(function()
{
$("#telo").animate({"top": "-=300"}, 500);
}
)
}
);
</script>
</head>
<body>
<div id="obolochka">
<div id="telo">
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</div>фигня всякая
<div id="knopka">
<input type="button" value="knopka">
</div>
</div>
</body>
</html>