Progressbar błąd? Opcje

[topik53]

[PHP] pobierz, plaintext 
<?php
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
 
if (@$_GET['id']) {
	echo json_encode(uploadprogress_get_info($_GET['uuid']));
	exit();
}
	$uuid = uniqid();
?>
<form enctype="multipart/form-data" action="aaa.php" method="POST">
<input name="img" type="file" /><br />
<input id="progress_key" name="UPLOAD_IDENTIFIER" type="hidden" value="<?php echo $uuid; ?>" />
 
<input type="submit" value="Wyslij"/>
<span id="uploadprogressbar" class="progressbar">0%</span>
 
</form>
<script type="text/javascript">
 
var progress_key = '<?php echo $uuid; ?>';
 
// this sets up the progress bar
$(document).ready(function() {
    $("#uploadprogressbar").progressBar();
});
 
// fades in the progress bar and starts polling the upload progress after 1.5seconds
function beginUpload() {
    // uses ajax to poll the uploadprogress.php page with the id
    // deserializes the json string, and computes the percentage (integer)
    // update the jQuery progress bar
    // sets a timer for the next poll in 750ms
    $("#uploadprogressbar").fadeIn();
 
    var i = setInterval(function() { 
        $.getJSON("aaa.php?id=" + progress_key, function(data) {
            if (data == null) {
                clearInterval(i);
                location.reload(true);
                return;
            }
 
            var percentage = Math.floor(100 * parseInt(data.bytes_uploaded) / parseInt(data.bytes_total));
            $("#uploadprogressbar").progressBar(percentage);
        });
    }, 1500);
}
</script>
<?php
$plik_tmp = $_FILES['img']['tmp_name'];
$nazwa = $_FILES['img']['name'];
$rozmiar = $_FILES['img']['size'];
if(is_uploaded_file($plik_tmp)) {
			move_uploaded_file($plik_tmp, "$nazwa");
			echo "Plik: <strong>$nazwa</strong> o rozmiarze 
			<strong>$rozmiar bajtów</strong> został przesłany na serwer!";
}
?>
[PHP] pobierz, plaintext 

Skrypt nie działa
Czy link musi być:

[PHP] pobierz, plaintext 
$.getJSON("aaa.php?id=" + progress_key, function(data)
[PHP] pobierz, plaintext 

Prosze o pomoc

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