Miscellany

<form method="post" action="upload_save.php" onsubmit="this.upload.disabled = true;this.button.disabled = true; document.getElementById('output').innerHTML='File Uploading...';" target="background-uploader" enctype="multipart/form-data" id="background-upload-form">
  File: <input type="file" name="upload" />
  <input type="submit" name="button" value="Upload" />
<div id="output"></div></form>