What do you do here facing this large over the top move?

PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (9 handed) converter

SB (t2840)
BB (t3025)
UTG (t3805)
Hero (t3230)
MP1 (t3660)
MP2 (t925)
MP3 (t2830)
CO (t1550)
Button (t1905)

Preflop: Hero is UTG+1 with J[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t300</font>, <font color="#CC3333">MP1 raises to t3660</font>, <font color="#666666">6 folds</font>, Hero ??