How to trade inter market internationally?

Assuming I live in the US and I feel Japan will be green tomorrow. And I want to buy some Japanese stocks that I think will go up when the Japanese market Nikkei opens tomorrow. What funds can I buy or trading method can I use in the US market now that I can profit from when the Japanese market turns out as I expected, tomorrow?How to trade inter market internationally?Individual stocks from other countries are called "adr"s" you can also buy Etf's exchange traded funds from most any country which is a like buying the dow jones average for that country. THD for thailand for examplle .... their are usually more than 1 EWJ is one for japan, typical japan index etf.