PP check up

[Bona]

All these guys play way too loose and aggressive.

It's 4 to me semi-cold preflop but it looks like this pot will get huge. OK to call it or no?

PokerStars 0.25/0.50 Hold'em (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is SB with T[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">UTG raises</font>, <font color="#CC3333">MP 3-bets</font>, <font color="#CC3333">CO caps</font>, Button calls, Hero calls, <font color="#666666">1 fold</font>, UTG calls, MP calls.

Flop: (21 SB) J[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
Hero checks, UTG checks, MP checks, <font color="#CC3333">CO bets</font>, Button calls, Hero calls, UTG calls, MP calls.

I can call this and see the turn right? We don't lead or c/r here do we?
Maybe even call one if UI on the turn?