PHP Website authentication

Hey hey. I am playing around with an upload feature on my website (so that I can upload a file from anywhere without having to ftp with filezilla or something fun like that). The upload feature works fine. I want to now password the page where you upload files (so random people can’t access it). I know how to use .htaccess and all that, but I do not want an entire directory passworded- just the one page.

This works on one server but not another because the second server is in cgi-php mode:

if ((!isset($PHP_AUTH_USER)) || (!isset($PHP_AUTH_PW))) {
/* No values: send headers causing dialog box to appear */
  	header('WWW-Authenticate: Basic realm="My Private Stuff"');
  	header('HTTP/1.0 401 Unauthorized');
  	echo 'Authorization Required.';
  	exit;

} else if ((isset($PHP_AUTH_USER)) && (isset($PHP_AUTH_PW))){

  	/* Values contain some values, so check to see if they're correct */

  	if (($PHP_AUTH_USER != "user") || ($PHP_AUTH_PW != "password")) {
	   /* If either the username entered is incorrect, or the password entered is incorrect, send the headers causing dialog box to appear */
	   header('WWW-Authenticate: Basic realm="My Private Stuff"');
	   header('HTTP/1.0 401 Unauthorized');
	   echo 'Authorization Required.';
	   exit;
  	} else if (($PHP_AUTH_USER == "user") || ($PHP_AUTH_PW == "password")) {
	   /* if both values are correct, print success message */
	   echo "<P>You're authorized!</p>";
  	}
} 
?>

Do you have any idea how to make this work under cgi? I read and attempted:

http://www.francey.org/articles/http-authe…on-php-cgi.html

but it didn’t work (though I’m an idiot and may have been trying it wrong).

Any help is appreciated.

PS.

I’m a TOTAL php noob so don’t assume I know anything in your response!

Rob