Untitled

Image upload form not posting input value when auto submitting form
var_dump(isset($_POST['uploaded']));
if( isset($_POST['uploaded']) )
{
 $img = new AvatarUpload();
 $img->startUpload();
}
else
{
 ?>
   <form method="post" enctype="multipart/form-data" name="uploadAvatar">
          <p>
          <input type="file" name="uploaded" id="file" onchange="this.form.submit()" />
          <p>
       </form>
 <?php
}
?>