Storing and Reteriving Data in Japanese

[sethi_kapi]

I already have changed NSL_LANG to Japanese.Still when i try to wtite say a insert into a table (say)Emp with empno and ename as
insert into emp values(1,'‚½‚ß‚ÄŽg‚¦‚éYahoo!ƒ|ƒCƒ“ƒg').
when i try to extract it shows ename as ???Yahoo??.
Can u suggest how i can say same when selecting from emp.