Errore con Smarty in Xampp

[tulipan]

Sto lanciando il seguente file Php in Xampp:

<?php

require 'J:/xampp/php/Smarty-2.6.26/libs/Smarty.class.php';

$smarty = new Smarty;

$smarty->compile_check = true;
$smarty->debugging = true;

$smarty->assign("Name","Fred Irving Johnathan Bradley Peppergill");
$smarty->assign("FirstName",array("John","Mary","James","H enry"));
$smarty->assign("LastName",array("Doe","Smith","Johnson"," Case"));
$smarty->assign("Class",array(array("A","B","C","D"), array("E", "F", "G", "H"),
array("I", "J", "K", "L"), array("M", "N", "O", "P")));

$smarty->assign("contacts", array(array("phone" => "1", "fax" => "2", "cell" => "3"),
array("phone" => "555-4444", "fax" => "555-3333", "cell" => "760-1234")));

$smarty->assign("option_values", array("NY","NE","KS","IA","OK","TX"));
$smarty->assign("option_output", array("New York","Nebraska","Kansas","Iowa","Oklahoma","Texas "));
$smarty->assign("option_selected", "NE");

$smarty->display('index.tpl');

?>

Smarty l'ho installato nella sottodirectory php di xampp. Ottengo il seguente errore:

Warning: require(../libs/Smarty.class.php) [function.require]: failed to open stream: No such file or directory in J:\xampp\htdocs\demo\index.php on line 3

Fatal error: require() [function.require]: Failed opening required '../libs/Smarty.class.php' (include_path='.;J:\xampp\php\PEAR') in J:\xampp\htdocs\demo\index.php on line 3

[luca200]

Ma com'è scritta la tua require?
A giudicare dall'errore, non è come l'hai postata