I want to write something in Japanese on my t-shirt-- but Zazzle says you can only write Latin characters... the only problem is that I've seen PLENTY of shirts on Zazzle with Japanese characters. How do I go about doing this?

You can write some Asian languages several ways, including in Latin characters. (Like Rōmaji for Japanese words.)
Can you do this with Russian?
I don't mean translate it into an English word.

Is there a website I can go to to do this? I want to type in an English word and get a result in Russian, in Latin characters.