I have a fairly large portion (25%)of my 401k in Janus Overseas. Its been going like a raped ape for a while now(86% in the last year) but with things taking a turn in Europe (Greece I'm looking at you) I'm wondering if its time to move that 25 percent to another fund. Is this a good idea? What would you recommend? Am I just (un?)educated enough to be dangerous to myself? Should I be doing more? I am still many years away from retirement (I'm 31) but I've got enough in it now to be nervous about taking big losses.