Galera como ficaria a substituição de mysql para mysqli nesse trecho a

COMO ERA:
// use phpSecurePages with Database
if ($useDatabase == true) {
// contact database
if ( empty($cfgServerPort) ) {
mysql_connect($cfgServerHost, $cfgServerUser, $cfgServerPassword)
or die($strNoConnection);
} else {
mysql_connect($cfgServerHost . ":" . $cfgServerPort, $cfgServerUser, $cfgServerPassword)

or die($strNoConnection);
}
$userQuery = mysql($cfgDbDatabase, "SELECT * FROM tb_users WHERE status='S' AND user = '$login'")
or die($strNoDatabase);

ERRO:

Warning: mysqli_select_db() expects exactly 2 parameters, 5 given in C:\VertrigoServ\www\sgr\protecao\checklogin.php on line 143

COMO ESTOU FAZENDO:

// use phpSecurePages with Database
if ($useDatabase == true) {
// contact database
if ( empty($cfgServerPort) ) {

mysqli_connect($cfgServerHost, $cfgServerUser, $cfgServerPassword)
or die($strNoConnection);
} else {

mysqli_connect($cfgServerHost . ":" . $cfgServerPort, $cfgServerUser, $cfgServerPassword)

or die($strNoConnection);
}
$userQuery = mysqli_select_db ($cfgDbDatabase, "SELECT * FROM tb_users WHERE status='S' AND user = '$login'")
or die($strNoDatabase);