middle pair - a plan?

[Octopus]

Party Poker 3/6 Limit - 10 handed

UTG+1 (a TAG) opens, MP2 (weak, a 26/2/.5 type) cold-calls, Hero is CO as a poster and calls with J[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/club.gif[/img]. The BB (too loose, too passive, but not excessively either one) also calls.

Flop: (4 players 8SB) A[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/diamond.gif[/img]
BB checks, UTG+1 bets, MP calls, Hero?

What is your plan?