Cosi...
codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>Untitled</title>
</head>
<body>
<table summary="">
<tr>
<td class="stilebluscuro11">
  Indirizzo IP: 
  

  Nazionalità: <span id="naz"></span>
  

  Sistema Operativo: <span id="so"></span>
  

  Risoluzione schermo: <span id="ris"></span>
  

  Browser: <span id="bro"></span>
</td>

</tr>
</table>
<script language="JavaScript" type="text/javascript">
<!--
document.getElementById('naz').innerText  = navigator.systemLanguage;
document.getElementById('so').innerText   = navigator.platform; 
document.getElementById('bro').innerText  = navigator.appCodeName; 
document.getElementById('ris').innerText  = screen.width + ' x ' + screen.height; 
 
//-->
</script>

</body>
</html>