jQuery Ajax编码

I have a big problem with this ajax encoding.

I use a cyrillic file which I want to load() into a div, but everything I see is ����� (little squares).

I tried everything I found here and in Google, but nothing helped me. I tried to $.ajaxSetup(ContentType: ); my ajax calls, I tried to add a header() in my php files... NOTHING CHANGED.

Please help! I need an IE solution. Thanks in advance!

FIXED! Everything works fine now, because I included some system files (e.g config.php, functions.php). I had this include problem with ajax before and I still got no the answer, but that's fine. Thank you, guys!