onkeypress doesn't work for japanese/chinese/korean

If I type characters using a Chinese text input (one where I type 2-3 latin characters for each Chinese symbol) there is no onkeypress or onkeydown event triggered. Any idea how to detect those characters please? I need to catch those chars in JS to pass them to a plug-in.

Thanks!

are you sure? what browser are you using, and we can see an example of the code?