Images resize problem?

Hvorfor vil denne kode ikke resize mit billede?

KODEN:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

<?php

if(isset($_POST['submit']))
{
$picture = $_SERVER['DOCUMENT_ROOT'].'/Images_upload_resize/images/'.$_FILES["picture"]["name"];
//$picture = $_FILES["picture"]["tmp_name"];

$width = 100;
$height = 100;

if(move_uploaded_file($_FILES["picture"]["tmp_name"], $picture))
{
    //header('Content-type: image/jpeg');
   
    list($width_orig, $height_orig) = getimagesize($picture);

    $image_color = imagecreatetruecolor($width, $height);

    $new_picture = imagecreatefromjpeg($picture);

    imagecopyresampled($image_color, $new_picture, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
   
    //echo 'Det viker';
    echo $picture . '<br />';
    echo $width_orig . '<br />';
    echo $height_orig . '<br />';
    echo $new_picture  . '<br />';
    echo $image_color  . '<br />';
} else {
    echo 'Virker ikke';
}

}
?>

<form name="form1" method="post" action="" enctype="multipart/form-data">
  <input id="picture"  name="picture" type="file" />
  <input type="submit" name="submit" value="Submit" />
</form>

SLUT KODEN::::::::::::::::::::::::::::::::::::::::::::::::::::::::

Casper