<?php
$db_host="localhost";   // Mysql hostname ( by default it should be localhost)
$db_user="username";  // Mysql username 
$db_pass="password"; // Mysql password
$db_name="database"; // Database
?>

<?php
db_connect(); // I created funcion to connect to mysql because it much more easy to use.
function db_connect()
{
    include('config.php'); // This line will include config.php to get configuration.
    if(!mysql_connect($db_host,$db_user,$db_pass)) er_exit(mysql_error()); 
    if(!mysql_select_db($db_name)) er_exit(mysql_error());
}
?>