Portable EE2 config variables

// Config overrides - http://expressionengine.com/wiki/EE_2_Config_Overrides/
$config['index_page'] = '';
$config['site_url'] = "http://${_SERVER['HTTP_HOST']}/";
$config['cp_url'] = $config['site_url'].SYSDIR."/index.php";
$config['captcha_url'] = "http://${_SERVER['HTTP_HOST']}/images/captchas/";
$config['emoticon_path'] = "http://${_SERVER['HTTP_HOST']}/images/smileys/";
$config['photo_url'] = "http://${_SERVER['HTTP_HOST']}/images/member_photos/";
$config['sig_img_url'] = "http://${_SERVER['HTTP_HOST']}/images/signature_attachments/";
$config['theme_folder_url'] = "http://${_SERVER['HTTP_HOST']}/themes/";
$config['theme_folder_path'] = "${_SERVER['DOCUMENT_ROOT']}/themes/";
$config['tmpl_file_basepath'] = BASEPATH."expressionengine/templates/";