a tough spot - facing 2 bets w/ top pair on flop

[Rhone]

MP is laggy, CO is unknown. My plan had been to CR the flop. Was this a mistake? And what's my plan now?

PokerStars 5/10 Hold'em (6 handed) converter

Preflop: Hero is SB with T[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/spade.gif[/img].
UTG calls, <font color="#CC3333">MP raises</font>, CO calls, <font color="#666666">1 fold</font>, Hero calls, BB calls, UTG calls.

Flop: (10 SB) 4[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
Hero checks, BB checks, UTG checks, <font color="#CC3333">MP bets</font>, <font color="#CC3333">CO raises</font>, Hero...

[bds]

Darned if I know. I think I've done all three things here - 3 bet, called and folded, depending I guess on my mood, subtle reads and how I've been running at the table.

[MoDOH]

Coontinue with the plan and CR. If MP:s image at the table is that he is a LAG CO could be CR with any pair here. PP or any pair with the board. A read on CO might help but since you don´t have one I think not threebetting here is a mistake