Advance poll Infinite Voting

hi i install and follow all step for install.

look.

http://www.s-test.cl/vitoto/dc/

Rigth Menu - Encuesta Panel.
that is Advance poll.
but i not can setting only users can voting one time.

i insert cookie in Top Frame.
---------------------------------------------------------------------------------
</head>

<?php
include_once "/www/htdocs/s-test/vitoto/dc/poll/db/poll_cookie.php";
?>

<body leftmargin="0" topmargin="0">
---------------------------------------------------------------------------------
AFTER HEAD AND BEFORE BODY.

who know problem ?

if i insert cookie in some HTML.
in refresh say error :

Warning: Cannot add header information - headers already sent by (output started at /www/htdocs/s-test/vitoto/dc/admin/test.htm:7) in /www/htdocs/s-test/vitoto/dc/poll/db/poll_cookie.php on line 21

LINE 21 is :

</head>
<?php
include_once "/www/htdocs/s-test/vitoto/dc/poll/db/poll_cookie.php";
?>
<body>

Your problem might be:

To put COOKIE on top of everything else!

The script is PHP so you want to instert the cookie in TOP of all the <HTML> tag!!!

So it would start with

<?PHP
BLA BLA BLA
<HTML>
<BODY>

Hope that helps...