Metodo 2

File test928a.php
codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>Untitled</title>
</head>
<body>
<form id="f1" action="test928b.php" method="post">
 <input type="hidden" name="availHeight">
 <input type="hidden" name="availWidth"> 
</form>
<script language="JavaScript" type="text/javascript">
<!--
document.getElementById('availHeight').value = window.screen.availHeight;
document.getElementById('availWidth').value  = window.screen.availWidth;
document.getElementById('f1').submit();
//-->
</script>

</body>
</html>
File test928b.php
codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<title>Untitled</title>
</head>
<body>
Available Height = <? print $_POST['availHeight'] ?>

Available Width  = <? print $_POST['availWidth'] ?>


</body>
</html>
Si potrebbe anche usare le sessioni.....