function getAppLoginUrl($siteid = null, $ip = null, $js = null)
{
$url = WindowsLiveLogin::getSecureUrl();
$url .= 'wapplogin.srf?app=' . WindowsLiveLogin::getAppVerifier($ip);
$url .= '&alg=' . WindowsLiveLogin::getSecurityAlgorithm();
$url .= $siteid ? "&id={$siteid}" : '';
$url .= $js ? '&js=1' : '';
return $url;
}