Pasted

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js">
</script>
<script> 
$(document).ready(function(){
  $("#flip").click(function(){
    $("#panel").slideToggle("slow");
  });
});
</script>
 <style> 
#panel,#flip
{
padding:5px;
text-align:center;
background-color:#e5eecc;
border:solid 1px #c3c3c3;
}
#panel
{
padding:50px;
display:none;
}
</style>
</head>
<body>
 <div id="flip">Click to slide the panel down or up</div>
<div id="panel">Hello world!</div>
 </body>
</html>