Problem with advanced Poll

Hello

having a problem with the advanced poll cookies :
this is what i have in my index.htm :
<html>
<head>
<title>Untitled</title>
</head>
<body>
<?php require "c:/phpdev3/www/poll/db/poll_cookie.php";

require "c:/phpdev3/www/poll/db/booth.php";
echo $php_poll->poll_process(4);
?>

</body>
</html>

But i still get the error Warning: Cannot add header information - headers already sent by

can anyone help me pls

thnx

<?php require "c:/phpdev3/www/poll/db/poll_cookie.php"; ?>
<html>
<head>
<title>Untitled</title>
</head>
<body>

<?php
require "c:/phpdev3/www/poll/db/booth.php";
echo $php_poll->poll_process(4);
?>

</body>
</html>

rename your index.htm file to index.PHP