In File requiring the connect:

function connect($state,$db) {
    if ($state=='open') {
        $_GET['db']=$db;
        include('scripts/script_connect.php');
    } else if ($state=='close') mysql_close();
}


In the Connect File:

if (!isset($_GET['db'])) die("I dont know which database to connect to! (db was not set as a parameter)");
$database_server = "localhost";
$database_user = "root";
$database_password = "";
$database_name = $_GET['db'];

$connection = mysql_connect($database_server, $database_user, $database_password);
if (!$connection) die('Connnection could not be established due to the following error: ' . mysql_error());

mysql_select_db($database_name, $connection) or die('The database could not be selected due to the following error:' . mysql_error());