Does anybody know if there is a way for users to change their passwords remotely via the Web?

I have several accounts for people who work only at remote (home) offices and never physically log in to the network. Their only access is via HTTP and FTP. I'm running NT4 Server and IIS 3. I am not running RAS at the moment.

What I would really like is a way that users could modify their own NT password from a Web page.

Any insights appreciated.