Problems with php

PHP:

<?php
require_once('extensions/register.php');



require_once('languages/language.php');

?>


ummm the url i´m running the script on is the following url]contact4cars.com/contact4cars.php_files/Page341.htm[/url]
any help would be great please, i am very very novice this is my first site please help!

 

my question is:
I´m implementing a php script on a html site and the script in the html does not see the actual .php file
example:
i´m have a html page (Page341.htm) and in that page there a php script called register.php
when i open page 341 in my browser and try to submit the registration it bring me pack a message saying page not found .
why!!!!!!!!!
please please help!