Posting To An External Site Without Url Change need help

I need help with some PHP, once again.

What I'm wanting to do is add something to an external database from a remote site.

Say we are using the script farsiscript posted (here), and there's an added feature where it saves the information to a database, and it's on a different server.

I want people to be on my site, enter the variables, and have the information submitted without knowing anything about the external site.

Also, would there be a way of confirming whether the information was submitted, or if there was an error? Like if the result said "Thank you!" would there be a way of displaying "success" on my page? Or the same thing with an error.

I've tried using fopen and some other tags to do this, but I've had no success.

Help would be appreciated!