Hello.

The first thing you have to know is that PHP is a so called Server-side script language wich means that it?s run on the server and the result of that is then sent to the browser (client).

So in order for your form to react to any interactions you use JavaScript wich is a Client-side script language wich means it?s run on the client (browser).

Have a look att some JavaScript frame works such as:
http://www.jquery.com

In other words use PHP on the server side for the backbone to take care of all the things you can do with PHP. Such as talking to database servers (MySQL) and others supported by PHP.
Have a look at http://www.php.net

For mor info on what you can do with PHP.

Good luck to you.

/Eye

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Of course the whole point of a doomsday machine, would have been lost if you keep it a secret.