The tool you want is called HTML Tidy:
http://www.w3.org/People/Raggett/tidy/

This tool cleans up HTML, and can also convert it to XML or XHTML.
I've used it to pre-process HTML documents before sending them
to an XSL processor.  It works great, just be sure to configure it
the right way.

As far as I know you can't do it with xslt which is meant to take xml as
input and produce xml or text or html as output, your html file is not well
formed xml (the INPUT tags are not closed) all xsl processor should reject
them.
Sorry.
Benoit
----- Original Message -----
From: "Janine Lopez" <jasminc_us@xxxxxxxxx>
To: <XSL-List@xxxxxxxxxxxxxxxx>
Sent: Wednesday, October 25, 2000 3:46 PM
Subject: html to xml

> Hi,
>
> I'm still a novice to XML/XSL and is looking for a
> good example of converting an HTML document to XML.
> The HTML to be converted is a logon page with the ff.
> similar format:
>

XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list