Multi language web page

it is quite simple..

index.php?lang=en

links to change lang.
?lang=hu
?lang=spa
?lang=deu

requesting,
$lang = $_request['lang'];
if ( $lang = "" || $lang = "en")
{
header('Location: /en/');
}
if ( $lang = "hu" );
{
header('Location: /hu/');
}

and so on....

if u wanna go further.. check explorer's default language.. that would be cool.