[AJAX] Recuperation variable de l'input

Bonsoir, je voudrais récuperer la valeur de mon input "kouk" dans le data.php mais je n'y arrive pas après moulte tentatives.

voici ma page :

Code:

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<?
foreach ($_POST as $key => $value) $$key = addslashes($value);
foreach ($_GET as $key => $value) $$key = addslashes($value);
?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" dir="ltr" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
	<script language="JavaScript">
	function submitForm(f)
	{ 
 
		document.getElementById("zone").innerHTML=null;
 
		if(window.XMLHttpRequest)
			req = new XMLHttpRequest(); 
		else if (window.ActiveXObject)
			req  = new ActiveXObject(Microsoft.XMLHTTP); 
 
		req.open("POST", "data.php", true); 
		req.onreadystatechange = function anonymous()
		{ 
			document.getElementById("zone").innerHTML="Recherche de la planète";
			if(req.readyState == 4)
			{
				if(req.status == 200)
				{
					document.getElementById("zone").innerHTML=req.responseText;	
				}	
				else	
				{
                    document.getElementById("zone").innerHTML = "Received:" + xhr.responseText;					}	
			} 
		}; 
		req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
		req.send(null); 
}
</script>
	</head>
 
	<body>
		<FORM name="ajax" action="" method="">
 
  <p>
       <INPUT type="text" value="pouet" name="kouk" id="kouk">
 <INPUT type="BUTTON" value="Submit"  ONCLICK="submitForm(this.form)">
  </p>
  <p>
<div id="zone">
    ... un texte à remplacer...
 </div> </p>
</FORM><a href="javascript:">ici</a>
	</body>
</html>

Voici ma page data.php

Code:

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<?
foreach ($_POST as $key => $value) $$key = addslashes($value);
foreach ($_GET as $key => $value) $$key = addslashes($value);
 
header('Content-type: text/html; charset=iso-8859-1');
echo('salut ! '.$kouk.'');
?>

merci