Plstform independent application.

Platform independent representation of japanese kanji characters.
Hello,
We have a problem in developing a platform independent web based application for kanji. We have no problem in hosting our application in windows web server (IIS), but we are facing problem while hosting the same application in UNIX web server(APACHE).We are using SHIFT_JIS charset.

The problem is UNIX do not support 2 byte charset(SHIFT_JIS). How can we convert 2 byte shift_jis to 1 byte char so that it is compatible on UNIX web Server.
Thanks a lot,
Peter.