JavaScript Script To Parse Text Fields From Multipart/form-data

Does anyone know where I can find an ASP server side script written in
JavaScript to parse text fields from a form method='POST' using
enctype='multipart/form-data'? I'd also like it to parse the filename.

<form name='form1' method='POST' enctype='multipart/form-data'
action='sub.asp'>
<input type='text' name='title1' value='value1'>
<input type='file' name='file1'>
</form>

I found a great ASP VBScript for uploading files, but the rest of my
Web site is coded in ASP using JavaScript and I can't figure out a way
to immediately pass the text fields already parsed from server side
VBScript to server side JavaScript.

My ASP code looks like this:

<script language="JavaScript" runat="server">
//I would like to add JavaScript to parse the text field and
filename of file1 here.
</script>
<!--The 3rd party document below parses all fields from the message
content and uploads any file fields it encounters.--->
<!--#include file="aspinclude/upload.asp"-->
<script language="JavaScript" runat="server">
//Add record here (title1, filename from file1).
</script>