Este es el código con el que probé :S:S
Código Javascript
:
Ver original<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Mensaje superior</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function() {
var panel= $("#firstpane")
panel.css({backgroundImage:"url(down.png)"}).next("div.menu_body").slideToggle(300).siblings("div.menu_body").slideUp("slow");
panel.siblings().css({backgroundImage:"url(left.png)"});
});
</script>
<style type="text/css">
</style>
</head>
<body>
<div id="firstpane">
<p>Linea 111111111111111111 </p>
</div>
<div id="menu_body">
<p> Linea 222222222222222222222 </p>
</div>
</body>
</html>