how do you say "whats up" in japanese?

i mean, really. we really need this magic phrase that means the same as "whats up?"
with this word, you can start a small conversation with almost everyone in the U.S.
but what about in japan?how should we start a conversation like the americans do?
oh, wait. this is takashi from yuki's computer.

well, only 3 days left... and at last, we finally finished our business plan.
when we first came to st. louis and spent a night with 29 rikkyo friends, 3 weeks in st. louis seemed like forever to me. but in 3 days, our biggest event of the summer will come to an end.
my feeling right now seems kind of wierd...it's like... i wanna go back but i wanna stay with my friends. we had many deep conversations and that's what made our relationship become very close.
i never thought this EAP program would be this amazing in terms of school work (ron and mr. hauff's class), fun activities, and most of all; chilling with my friends. i'd like to thank all the people who planned and managed this program.
well, there's still 3 days left so i'd like to take my best chances to learn more and become a better person.

thanks, i'll see you soon.