Forget the above, there is a much more conveniant way to do it. Simply add the following to your .htaccess file:

Code:
RewriteRule ^lang/(.*)/ language.php?lang=$1 [L,QSA]
after that you can change language by using the following stucture:

Code:
<a href=www.yoursite.com/lang/nameyourfolderhere/>name of your language</a>
Seems I am getting deeper into it ;-)