Cookie Problems (Different than the post by David Jackson)

Here's a snippet of the code. I'm sending the setcookie header out long before any of the other headers, but I'm still getting: Warning: Cannot modify header information - headers already sent by (output started at C:\wwwroot\index.php:4) in C:\wwwroot\index.php on line 7 -----Code------ <? function cookie_set($userid){ if (isset($userid)){ setcookie("vfsnet", $userid, time()+600); } } cookie_set($_GET['user']); ?> <html> <head> <? include('lib/sessionfunc.php'); include('lib/dbconnect.php'); include('lib/filefunc.php'); include('lib/urlfunc.php'); ?> <link rel="stylesheet" type="text/css" href="themes/master.css"> <title>Website0001</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> </head> ---Code--- Any ideas? Thanks Brian