Site not running...going crazy - Joomla! Forum - community, help and support

hi

my site not working shows error :

<?php
/**
* @version $id: index.php 11407 2009-01-09 17:23:42z willebil $
* @package joomla
* @copyright copyright (c) 2005 - 2009 open source matters. rights reserved.
* @license gnu/gpl, see license.php
* joomla! free software. version may have been modified pursuant
* gnu general public license, , distributed includes or
* derivative of works licensed under gnu general public license or
* other free or open source software licenses.
* see copyright.php copyright notices , details.
*/

// set flag parent file
define( '_jexec', 1 );

define('jpath_base', dirname(__file__) );

define( 'ds', directory_separator );

require_once ( jpath_base .ds.'includes'.ds.'defines.php' );
require_once ( jpath_base .ds.'includes'.ds.'framework.php' );

jdebug ? $_profiler->mark( 'afterload' ) : null;

/**
* create application
*
* note :
*/
$mainframe =& jfactory::getapplication('site');

/**
* initialise application
*
* note :
*/
// set language
$mainframe->initialise();

jpluginhelper::importplugin('system');

// trigger onafterinitialise events
jdebug ? $_profiler->mark('afterinitialise') : null;
$mainframe->triggerevent('onafterinitialise');

/**
* route application
*
* note :
*/
$mainframe->route();

// authorization
$itemid = jrequest::getint( 'itemid');
$mainframe->authorize($itemid);

// trigger onafterroute events
jdebug ? $_profiler->mark('afterroute') : null;
$mainframe->triggerevent('onafterroute');

/**
* dispatch application
*
* note :
*/
$option = jrequest::getcmd('option');
$mainframe->dispatch($option);

// trigger onafterdispatch events
jdebug ? $_profiler->mark('afterdispatch') : null;
$mainframe->triggerevent('onafterdispatch');

/**
* render application
*
* note :
*/
$mainframe->render();

// trigger onafterrender events
jdebug ? $_profiler->mark('afterrender') : null;
$mainframe->triggerevent('onafterrender');

/**
* return response
*/
echo jresponse::tostring($mainframe->getcfg('gzip'));

what should doing now?

ok see .....this isn't error index.php file opening...is there wrong .htacess or php.ini ? had copied php.ini file , .htacess file yesterday..but didn't make changes.....please someone