encoding for the validation message in Japanese

Hi
I'm trying to change a form validation message into Japanese but it's coming out mumbo jumbo. Like this ....
�K�v�ȍ��ڂ�S�Ă��L��肢���܂��B

This is the code I've added to functions.php ....

add_filter("gform_validation_message", "change_message", 10, 2);
function change_message($message, $form){
return "必要な項目を全てご記入お願いします。";
}

What would I need to add to change the encoding to something that will give me the Japanese?

Thanks
Mark

Yes we did. It worked when I just had to do two characters, but I thought there might be a better way to do it by specifying the encoding or something. Using HTML entitys for long sentences is going to be a bit of a pain.

Is there no place I could just specify the charset and be done with it?

Thanks
Mark