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update div value - JQuery Toastmessage-plugin
header('Location: completed.php?message=Successful operation. Data inserted for user: ' . $login->get_username() . ' . See home page for infos.');

<div id="msg">
<?php echo $_GET['message']; ?>
</div>

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script src="js/jquery.toastmessage.js" type="text/javascript"></script>
<link href="styles/jquery.toastmessage.css" rel="stylesheet" type="text/css" />

...

<script type="text/javascript">
function showStickyNoticeToast() {
        $().toastmessage('showToast', {
            text: $('#msg').val(),
            sticky: true,
            position: 'bottom-left',
            type: 'notice',
            closeText: '',
            close: function () { console.log("toast is closed ..."); }
        });
    }
</script>

<script type="text/javascript>
<!--
$('#choose').change(function(event) {
    $.get('messages.php', { selected: $('#msg').val() },
        function(data) {
            $('#update').html(data);   // other div wher store data
        }
    );
});
</script>

<?php

$alfa = isset($_GET['message']) ? $_GET['message'] : 'nothing';
echo $alfa;
?>

$msg = "Successful operation etc. etc.";
header("Location: completed.php?message="+urlencode($msg));

function showStickyNoticeToast( message ) {
        $().toastmessage('showToast', {
            text: message,
            sticky: true,
            position: 'bottom-left',
            type: 'notice',
            closeText: '',
            close: function () { console.log("toast is closed ..."); }
        });
    }


$.post( url , dataToserver, function(data){
      showStickyNoticeToast( $(data).text())
      $('#update').html(data);

})