A bad beat?

[Godders]

Ok, here's the set up: Very early in a $0.50 + $0.10 10-seater single table SnG Blinds are @ level 1: $10/$20 Seat 1: $1,780 Seat 2: $1,000 (SB) Seat 3: $2,120 (BB) Seat 4: $1,630 Seat 5: $1,480 (me) Seat 6: $1,380 Seat 7: $1,480 Seat 8: $1,190 Seat 9: $1,470 Seat 10: $1,470 Seat 4 calls, and I've got Jd, Ac. I figured that in a micro stakes SnG, this hand is worth a play, so I raise to $80. Everyone folds round to the SB who calls, as does BB and seat 4. Flop comes Ts Jh 8d. Action is checked to me. I figure I have this hand won at this stage, so I jump in with a bet of $160. SB calls, BB folds and Seat 4 calls. Turn comes 8h. Again the action is checked to me. I raise to $760, which is the small blind's stack (in hindsight, this was pretty stupid since I forgot about the potential sidepot), but it had the desired effect since SB called all in and seat 4 folded. I show my J A, feeling pretty smug, only to see SB turning over 7s 8s. Pretty gutted after that seeing that! So my question, as a real newbie, to you is... Would any of you played the hand differently? I've been critiquing my performance myself (over and over!), and the only two differences I would have made would be possibly laying down the hand to begin with (I appreciate AJ off is not a great starting hand in early position), and looking at that final bet again. I'm thinking possibly another half-pot bet would have been better on the turn since Seat 4 probably would have folded to any action, a re-raise from the SB would make me worry about him holding A8 (I'm not sure K,Q,J or T8 would be strong enough to call a 4x BB raise pre-flop even at this level), and even if the SB called, he possibly would have bet first on the river with his trips giving me another chance to get out. I would appreciate any input from you more experienced folk! Thanks in advance...

[muttley]

Re: A bad beat? 1) I wouldn't get involved with A,J out of position this early in a SnG. 2) The flop is dangerous. You can't be sure you're ahead with top pair top kicker here. Take a stab by all means, but once you get a call you should be done with the hand. 3) Once the second 8 comes down you should check. Your opponent would have bet the river, but chance are you wouldn't have lost as many chips, even if you decided to call. 4) Try to get away from the idea that top pair, top kicker is a lock hand.