Hey Hooper, I said "fwiw" because I don't think the version of online.php was important to the hack ... but anyway...
Look at the code just below what you posted ... it should have another set of form tags, which should look like this:
Code:
<form action="admin_online.php" name="name" method="post">
Last night it was "online.php", and I think that was the only problem I had ... have you tried redownloading the attachment above?