Uploaden gaat niet?

Ik heb dit uploadscript gemaakt:
<?
if ($_POST[submit])
{
if (is_uploaded_file($_FILES['image']['tmp_name']))
{
if ($_FILES['image']['size'] > 51200)
{
echo "Het bestand is te groot!";
exit;
}

if (!ereg("((.gif|.jpg)$)", $_FILES['image']['name'], $extensie))
{
echo "Dit bestandstype is <b>niet</b> toegestaan!";
exit;
}

$uploadfrom = $_FILES['image']['tmp_name'];
$uploaddir = "/upload/"; // set this to wherever
$uploaddir += $_FILES['image']['name'];

if (!move_oploaded_file($uploadfrom, $uploaddir))
{
echo "Er is iets misgegaan!";
}
else
{
echo $_FILES['image']['name'] . "succesvol geupload!!!";
}
}
else
{
echo "Het uploaden is mislukt!";
}
}
else
{
echo "<form enctype=\"multipart/form/data\" action=\"$PHP_SELF\" method=\"post\">";
echo "<input type=\"hidden\" name=\"MAX_FILE_SIZE\" value=\"51200\">";
echo "Upload afbeelding: <input name=\"image\" type=\"file\">";
echo "<input type=\"submit\" value=\"Upload!\" name=\"submit\">";
echo "</form>";
}
?>
Maar wat ik ook probeer hij blijft altijd maar "Het uploaden is mislukt!" aangeven :(
Ziet iemand mss een fout?

En ja de dir upload bestaat ;)