<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://edu.jb51.net/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("#flip").click(function(){
$("#panel").slideToggle("slow");
});
<style type="text/css">
#panel,#flip
{
padding:5px;
text-align:center;
background-color:#e5eecc;
border:solid 1px #c3c3c3;
}
#panel
padding:50px;
display:none;
</style>
</head>