PHP POST method using javascript

This is my situation:
I have a directory listing script that lists through directories with backups. Each file (backup) has link labeled "restore" which trigger a javascript function submitPostLink() and that function trigger another script which restore selected backup.
The important part of a code is:

 
        <script language=javascript type=text/javascript>
        function submitPostLink(file) {
              if(confirm("Do you really want to restore backup "+ file +"?")) {
                    document.postlink['backup'].value = file;
                    document.postlink.submit();
              }
        }
        </script>
        <form action="index.php" name=postlink method="post">
                <input type="hidden" name="backup" value="">
        <a href=# onclick="submitPostLink('<?php echo $files[$i] ?>');">restore</a>
 

Code (text):

$file[$i] is a variable with a current name of a file. I need that to POST it not to GET it and it has to be a hyperlink not a button or something like that. That's why I'm using a javascript, to submit that form.

When I'm listing a directory with only one backup and I click on restore hyperlink, it works well, but when there are more than one backup, the javascript function is called with a right variable (I know that because 'confirm("Do you really want to restore backup "+ file +"?"))' has a right variable file) but will not submit that form.

Could you help me sort it out, please?

 

Is postlink part of the Javascript api or are you using a library like jquery? Anyway my suspicion is that you need to call postlink on the form not the document.

$('form_id').postlink

 

How are you coding the loop? Maybe there is a problem with the "a tag" in the loop. But if you can "alert" the right file name then... With a button does it work?

 

I forgot to write that this problem is already SOLVED. Sorry for this, I wrote it at three forums. It was the problem with the loop.