PHP -> MS SQL -> Windows .net server 2003 PROBLEMS

PHP in MS SQL problem doesn't run

Hi

i'm running ms windows .net server 2003 Enterprise
and installed MS SQL server 2000 readed the article:
http://www.devarticles.com/art/1/100

and did everything it said and when I came to the part where I must run a php script to test the link from php to sql DB
script:

<?php

$myServer = "localhost";
$myUser = "sa";
$myPass = "";
$myDB = "Northwind";

$s = @mssql_connect($myServer, $myUser, $myPass)
or die("Couldn't connect to SQL Server on $myServer");

$d = @mssql_select_db($myDB, $s)
or die("Couldn't open database $myDB");

?>


it just shows plain text like the source code what have i done wrong ? ? ??? ? ? ? !

any help is welcome !!! ! !