hai ragione, ma questo richiesta d'aiuto lo proposta tante volte( con codice e tutto) senza risposta che onestamente disperavo

grazie a te e tutto qui di seguito


questa è la pagina

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>THISWEB _ Web Design</title>
<!--[if lt IE 9]>
<script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<link href="css/reset.css" rel="stylesheet" type="text/css" />
<link href="css/tipografia.css" rel="stylesheet" type="text/css" />
<link href="css/style.css" rel="stylesheet" type="text/css" />
<script src="js/jquery.js" language="javascript"></script>
<script src="js/script.js" language="javascript"></script>

<meta http-equiv="Content-type" content="text/html; charset=iso-8859-1" />
<meta http-equiv="Content-Language" content="it" />
<meta name="Robots" content="All" />
<meta name="Description" content="THISWEB" />
<meta name="Keywords" content="WEBDESIG" />
<meta name="Owner" content="thisweb" />
<meta name="Author" content="thisweb" />
<meta name="Copyright" content="thisweb" />



</script>
</head>
<body>
<div id="container">
<div id="left">
<div id="top">
<div id="header">[img]img/head.gif[/img]</div>
<div id="about">
<h2 class="green">new <span class="black">site</span>//new <span class="black">busisness</span></h2>
</div>

</div>
<div id="menu">

<h4>Servizi</h4>
<ul class="accordion" >
[*]Siti Web <span class="new">.new</span>
[*]Grafica <span class="new">.new</span>
[*]Social Network <span class="new">.new</span>[/list]
<h4>Web</h4>
<ul class="accordion" >
[*]www.stefanocapuzzi.com <span class="new">.new</span>
[*]www.simonazanotti.com <span class="new">.new</span>
[*]www.faustipasticceria.it <span class="new">.new</span>[/list]
<h4>Grafica</h4>
<ul class="accordion" >[*]La Casa sull'Albero[*]loghi[/list]
<h4>contact</h4>

</div>
<div id="footer"><h2 class="black">© 2011 <span class="green">this</span><span class="black">WEB</span></h2></div>
</div>
</div>
<div id="doc">
<div id="content">
<?php
if($_GET[menu]!='')
{
include $_GET['menu'].".php";
}
else
{
include "news.php";
}
?>
</div>
</div>

</body></html>

questo è il codice javascript

// JavaScript Document
$(document).ready( function() {
$('#menu h4 a').click( function() {
if (!$(this).hasClass('selected')) {
$('ul.accordion').slideUp(400);
$('#menu h4 a').removeClass('selected');
$(this).addClass('selected').parent().next().slide Down(400);
}
});

});

grazie