Anyway to prevent this mess?

How would you have played this on each street and why?

I knew he had a weak hand or a draw on the flop, what I didnt know was that he caught the two pair on the turn..

***** Hand History for Game 2366630047 *****
$200 NL Texas Hold'em - Friday, July 15, 03:43:57 EDT 2005
Table Table 55199 (6 max) (No DP) (Real Money)
Seat 1 is the button
Total number of players : 6
Seat 1: ppisriggedAA ( $438.55 )
Seat 2: EvilEcstasy_ ( $221 )
Seat 3: stevesc212 ( $88 )
Seat 4: MalfadorII ( $633.23 )
Seat 5: Turbob1zzle ( $262.45 )
Seat 6: UncleSol ( $117.80 )
EvilEcstasy_ posts small blind [$1].
stevesc212 posts big blind [$2].
** Dealing down cards **
Dealt to EvilEcstasy_ [ Ad Jc ]
MalfadorII calls [$2].
Turbob1zzle folds.
ppisriggedAA raises [$9].
EvilEcstasy_ calls [$8].
stevesc212 folds.
MalfadorII folds.
** Dealing Flop ** [ 2h, Qd, Jd ]
EvilEcstasy_ bets [$20].
ppisriggedAA calls [$20].
** Dealing Turn ** [ 9c ]
EvilEcstasy_ checks.
ppisriggedAA bets [$30].
EvilEcstasy_ calls [$30].
** Dealing River ** [ 5c ]
EvilEcstasy_ checks.
ppisriggedAA bets [$50].
EvilEcstasy_ calls [$50].
ppisriggedAA shows [ 9d, Js ] two pairs, jacks and nines.
EvilEcstasy_ doesn't show [ Ad, Jc ] a pair of jacks.
ppisriggedAA wins $220 from the main pot with two pairs, jacks and nines.

It looks like you had a good read on him because from that hand I would have bet half the pot ($10) on the flop and folded the turn.

I would have played it by betting 1/2 the pot on the flop and if he called, repeating the bet on the turn. If he called that too I would put him on a draw. If he raises I, fold the hand.

You've got bottom pair on a board with a flush and a straight draw. The 9 on the turn looks scary to me and I would fold to a $30 bet right there, esp. with middle pair.

The call on the river is just an obvious mistake.

My whole approach to this would have been different, I think. You bet the whole pot on the flop - I think I'd probably bet less, like between $10 and $14, to get my information cheaper. In this case he's probably still flat-calling you with the hand he's got.

On the turn then I'd still lead out. The 9 is not obvious trouble unless he has KT. The pot would be in the neighborhood of $44, and I'd bet $20 to see where I stand. At that point he's probably raising; depending on the amount of the raise you can fold, or call (if the pot odds are good) just to see the river and try to get a cheap showdown. On the river I check/fold to a big bet.

The way you actually played it makes for a little trouble. You were aggressive up front, which is fine, but then immediately cooled off on the turn which leaves you in the dark information-wise. A player with any hand or draw is going to bet into you after you check the turn, because it looks like you were bluffing the flop. So you're in the awkward position of not knowing if he still is on a draw, or made a real hand and is ahead of you - and you have to call any reasonable bet for the rest of the hand. It's a perfect setup for him to extract value from his two pair.

I think in order to find out more about what he has, you have to bet something on the turn, which is easier if you lead out for less on the flop (the pot doesn't get huge so fast). Once he hits the 9 he'll probably raise you, and you can put him on two pair or maybe a straight, and play it accordingly. (He wouldn't call the flop and raise the turn with a diamond flush.)