Protect your hand

[Avivs]

you wanted to enter a $100 No Limit tournament online but misclicked and found yourself in a $10 single table limit holdem instead...
the game is fairly loose aggressive.
at the 2nd level with blinds 15-30 you pick up [img]/forums/images/icons/diamond.gif[/img] 7 - [img]/forums/images/icons/heart.gif[/img] 5 in the big blind.
there are 4 callers, you check and the flop comes: [img]/forums/images/icons/heart.gif[/img] 9 - [img]/forums/images/icons/heart.gif[/img] 8 - [img]/forums/images/icons/spade.gif[/img] 6.
you are the first to act.
what do you think is the best way to protect your hand?