Read php parameters

I have a swf movie embedded in a php file, so when I load the page. I do it in this way

localhost/readURL.php?lang=en

Is there a way to read the value of lang in the swf movie ??. Because I need to call it with diferents languages (en,es,fr,de) and I need to change the language of the swf movie, without loading another swf movie

Thanks for your help