Passages des paramètres sans utiliser bouton submit

<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
 
<script language="JavaScript">
 
    function createInstance()
    {
        var xhr;
        if (window.XMLHttpxhruest)
        {
            xhr = new XMLHttpxhruest();
        }
        else if (window.ActiveXObject)
        {
            try {
                xhr = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e)
            {
                try {
                    xhr = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (e)
                {
                    alert("XHR not created");
                }
            }
            }
        return xhr;
    };
 
    function storing(data, element)
    {
        element.innerHTML = data;
    }
 
    function submitForm(element)
    {
        var xhr =  createInstance();
 
        xhr.onreadystatechange = function()
        {
            if(xhr.readyState == 4)
            {
                if(xhr.status == 200)
                {
                    storing(xhr.responseText, element);
                     
                }  
                else   
                {
                    alert("Error: returned status code " + xhr.status + " " + xhr.statusText);
                }  
            }
        };
        xhr.open("GET", "serveur_Ajax.php", true);
        xhr.send(null);
    }
 
</script>
</head>
 
<body>
<form id="form1" name="form1" method="get" action="serveur_Ajax.php">
  <div align="center">
    <table width="338">
      <tr>
        <td width="330" height="62"><label for="recherche">Recherche: </label>
        <input type="text" name="search" id="search" onkeypress="submitForm(document.getElementById('storage'))" /></td>
      </tr>
      <tr>
        <td height="149"><p> <span id="storage"> </span></p></td>
      </tr>
    </table>
  </div>
</form>
</body>
</html>

<?php
$cnx = mysql_connect( "localhost", "root", "") ;
$db = mysql_select_db("bd");

$search= $_GET['search']);

$sql = "SELECT nom, prenom FROM Client WHERE nom LIKE '".$search." %' or prenom LIKE '".$search." %'";
 
$sql = "SELECT Nom, Prenom FROM client WHERE Prenom LIKE '".$search."%'";
 
$requete = mysql_query($sql, $cnx) or die( mysql_error() ) ;

if($requete){
     
echo "<ol>";
while ($data = mysql_fetch_array($requete)) {
 
 echo "<li><a href='#' rel="nofollow noopener noreferrer" target="_blank">".$data."</a></li>";
}
         
echo "</ol>";

}