KJs, A simple flop question

[Azhrarn]

Early hand, but I can already tell the table is loose. UTG's a TAG. MP3's a thinking LAG. Rest are unknown.

Party Poker 5/10 Hold'em (9 handed) converter

Preflop: Hero is Button with K[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/diamond.gif[/img]. CO posts a blind of $7.
<font color="#CC3333">UTG raises</font>, UTG+1 calls, MP1 calls, <font color="#666666">1 fold</font>, MP3 calls, CO (poster) calls, Hero calls, <font color="#666666">2 folds</font>.

I rarely coldcall, but this seemed like the right spot.

Flop: (13.80 SB) 4[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(6 players)</font>
<font color="#CC3333">UTG bets</font>, UTG+1 calls, MP1 calls, <font color="#CC3333">MP3 raises</font>, <font color="#CC3333">CO 3-bets</font>, Hero...

Call or cap? Why?