PF all-in...newb question

I started out ok, but I got tangled w/ chip leader (who's loose, overbets & bad) & lost. I also lost AA v 77 PF all-in (I raise, he goes AI)vs the BB earlier.

Hand 1
PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (7 handed) converter

SB (t1495)
BB (t755)
UTG (t1095)
MP1 (t2695)
MP2 (t1372)
Hero (t515)
Button (t5573)

Preflop: Hero is CO with 9[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to t515</font>, <font color="#666666">3 folds</font>.

Final Pot: t665
<font color="blue"> Normally I raise 3 to 3.5 times the BB, but in these situations where my stack is pretty small, I should just go AI right? Up to what amount should I just be pushing? </font>



Hand 2
PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (7 handed) converter

MP2 (t2790)
CO (t1560)
Button (t1095)
SB (t2245)
BB (t377)
Hero (t665)
MP1 (t4768)

Preflop: Hero is UTG with K[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/spade.gif[/img].
<font color="#666666">Hero folds?</font>
<font color="blue"> Is this fold ok? </font>