PHP writable issue with move_uploaded_file

After changing the file permissions to allow a picture upload I am now getting Internal Server Error and none of the following code is having a chance to execute. This all happened when I changed the file permissions of the folder /upload.

THE PHP

<?php

$filename = 'http://www.divethegap.com/update/z-images/admin/upload/test.gif';
if (is_writable($filename)) {
    echo 'The file is writable';
} else {
    echo 'The file is not writable';
}

print_r($_FILES);
if ($_FILES['thumbfile']['开发者_JAVA百科error'] === UPLOAD_ERR_OK) {
    $info = getimagesize($_FILES['thumbfile']['tmp_name']);
    if (($info[2] !== IMG_GIF) && ($info[2] !== IMG_JPEG)) {
       die("not a gif/jpg");
    }
    if (filesize($_FILES['thumbfile']['tmp_name']) > 20000) {
       die("larger than 20000");
    }
    move_uploaded_file($_FILES['thumbfile']['tmp_name'], 'http://www.divethegap.com/update/z-images/admin/upload/test.jpg');

      echo '<script type="text/javascript">
parent.document.getElementById("thumbprogress").innerHTML = "Archiving"</script>Archiving';

  }
else
  {
  echo '<script type="text/javascript">
parent.document.getElementById("thumbprogress").innerHTML = "Invalid File Format"</script>Invalid File Format';
  }
?>

Currently the file permissions of the upload folder are open to all as writable.

Any ideas whats wrong?

Marvellous

---

You should upload to a local folder, not to an internet URL, ej:

$filename = '/var/www/my-site/z-images/admin/upload/test.gif';