Udskifte billeder med upload

Nu kender jeg ikke artiklen, men hvis du benytter move_uploaded_file() kan du gøre noget lig:

// hent id på varen ind i $id, eks:
$id = 13;
$newfilename = $id . ".jpg";
move_uploaded_file($_FILES['userfile']['tmp_name'], $newfilename);

Det lyder som et godt forslag, men lige nu går det helt agurk med upload.. Jeg paster lige koden:

<html>
<head><link rel="stylesheet" type="text/css" href="../style.css"></head>
<body bgcolor="#ffffff">

<?php
$vareid=$_GET['vareid'];
echo("<b>Du har valgt at tilføje eller ændre billedet for varenr. $vareid.</b><BR><BR>");
?>

<?php
//upload.php
function upload_form() {
global $PHP_SELF;
$vareid=$_GET['vareid'];
echo("Nuværende billede:<BR><img src=\"../varebilleder/$vareid.jpg\"><BR><BR>");
?>
<form method="post" enctype="multipart/form-data" action="<?php echo $PHP_SELF; ?>">
<input type="hidden" name="action" value="upload">
Upload file!
<input type="file" name="userfile">
<input type="submit" name="submit" value="Upload">
</form>
<BR>
<a href="../admin.php">Tilbage til admin forside</a>
<?php
}

function upload_file() {
global $userfile, $userfile_name, $userfile_size, $userfile_type, $archive_dir, $max_filesize, $WINDIR;

$archive_dir="/www/html/v2/varebilleder";

if(isset($WINDIR)) { $userfile = str_replace("\\\\","\\", $userfile); }

$filename = basename($userfile_name);
$max_filesize = 40000;

if($userfile_size <= 0) die ("$filename is empty");
if($userfile_size > $max_filesize) die ("$filename is too big! Only $max_filesize bytes allowed!");

if(isset($WINDIR) && !@unlink($userfile)) die ("Can't delete the file $userfile_name.");

echo "<img src=\"../varebilleder/$filename\"><br>";
echo "$filename has been successfully uploaded.<br>";
echo "Filesize: " . number_format($userfile_size) . "<br>";
echo "Filetype: $userfile_type<br>";
}

?>
<html>
<head><title>File upload</title></head>
<body>
<?php
if($action == 'upload') {
upload_file();
} else {
upload_form();
}
?>

Nogen der kan se hvorfor det ikke virker? :-(

Lukker