make additional upload form fields appear

I have an upload form (which can be seen here: [url]http://kmkwebdevelopment.com/formtest/upload.php[/url]). There are currently 5 “upload” fields, and I would like to have it so that if a person requires more “upload” fields, they can click on a + sign or something and it will then show an additional “upload” field (so they can upload up to 20 files at a time).
The upload form works great, but I just don’t want to have 20 separate upload fields on the page at once. I would really like to integrate this into it: [url]http://www.maheshchari.com/multifile-upload/[/url] which allows you to click “add another” and then another “file upload” field is displayed, but I don’t know if I can integrate this Javascript solution into my current PHP form because how can you tell the submit button to do 2 different form actions at once? This is from my current PHP code:

[code=php]<form class=”uploadform” action=”<?php echo $_SERVER[“PHP_SELF”] ?>” method=”post” enctype=”multipart/form-data” onSubmit=”return CheckForm(this);”>[/code]

AND this is part of what I would have to integrate:

[code=php]<form action=”uploader.php” method=”post” enctype=”multipart/form-data” name=”mutiple_file_upload_form” id=”mutiple_file_upload_form”>[/code]

How are you supposed to tell the submit button to do both form actions??

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