lo hice como me dijistes y me quedo de la siguiente maneraconfig.php<?php
session_start();//iniciamos la sesion
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="
http://www.w3.org/1999/xhtml"><head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
</head>
<?
$dbhost="localhost"; //Host del mysql
$dbuser="usuario"; //Usuario del mysql
$dbpass="password"; //Password del mysql
$db="basededatos"; //db donde se creará la tabla users
//conectamos y seleccionamos db
mysql_connect("$dbhost","$dbuser","$dbpass");
mysql_select_db("$db");
?>
<body>
</body>
</html>
y me sigue dando el mismo puto error jejeje Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/puntonet/public_html/login.php:7) in /home/puntonet/public_html/config.php on line 2
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/puntonet/public_html/login.php:7) in /home/puntonet/public_html/config.php on line 2