Party 500K, early JJ on under-flop (bet out or check/fold)

Do I bet out here, and fold if re-raised, or do I assume they are on AA/KK and check/fold?

Party Poker No-Limit Hold'em Tourney, Big Blind is t20 (10 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

BB (t830)
UTG (t1930)
UTG+1 (t1220)
UTG+2 (t910)
Hero (t1795)
MP2 (t1800)
MP3 (t4030)
CO (t2110)
Button (t6025)
SB (t1420)

Preflop: Hero is MP1 with J/images/graemlins/club.gif, J/images/graemlins/spade.gif.
<font color="#CC3333">UTG raises to t80</font>, UTG+1 calls t80, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t200</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">CO raises to t400</font>, <font color="#666666">3 folds</font>, UTG folds, UTG+1 folds, Hero calls t200.

Flop: (t990) 9/images/graemlins/club.gif, 6/images/graemlins/heart.gif, 5/images/graemlins/spade.gif <font color="#0000FF">(2 players)</font>
Hero ???

[DyessMan89]

Im flat-calling the first raise, and as it turned out, Im folding to the next.

Im sure you probobly led at this flop, and were knocked out by an overpair.

Well on this flop, I check/folded. Was this too weak-tight, or the right play? Should I have called the 200 pre-flop, for a pot that was ~700 already?