[pdiggz]

Raise flop to $5 or so. Call if he shoves. Even if you are behind you have a big flush draw, an overcard, and backdoor straight. You have plenty of outs, if behind.

On turn - I think calling is very bad. I think you are in a raise/fold spot on turn. This is why raising the flop is best; you avoid these situations. Calling is throwing away money, in my opinion. If you hit flush on river, he'll check and you won't get paid anyways.