It was a good suggestion, but the moment I change the page settings to iso-8859-1, it converts my Japanese characters to Ascii characters.
I don't understand why Japanese isn't compatible with .php though... I tested the page with the Japanese Shift-JIS settings and it works perfectly.
$LANG_charset="Shift_JIS";
I only have Internet Explorer, and am running on a Japanese computer, but I think it'd probably be the same for everyone.
Try this page, if you have any problems with it please let me know. Otherwise I think it should be good to go the way it is now.
http://www.msgplus.net/~translator/global.php?lang=jp