codice:
<!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>

<style type="text/css">

html, body {
 text-align:center;
}

</style>

<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Lunargate.net</title>
<link href="stile.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div style="text-align:left;margin-left:auto;margin-right:auto;" id="raccoglitore"> 
  <div id="header">
    <div align="right">[img]immagini/header-right.jpg[/img]</div>
  </div>
  <div align="right" id="menu">
    <div class="testo">
      

Menu di destra</p>
      

abcd</p>
    </div>
  </div>
    <div id="centrale">
      <div class="testo">


 abcdefghilmnopq</p>
      </div>
    </div>
<div align="center" id="credits"> Credits</div>
</div>
</body>
</html>
prova così.