[Roland]

First, where do you play? If you play on a site the converter doesn’t work for but want to post hands regularly, you should consider switching to a supported site. It’ll make things much easier and you will get more (and better) replies.

Second, what’s the ante in this game? Not that it matters in this hand, but it usually does.

Okay, about the hand:
I’d re-raise right away on 4th. If he has trip 8s, so be it. I’m not giving the other guy credit for trip jacks either.
5th street is a tough spot. He could be full, he could have quads, he could have just eights. Good only knows. I’d bet and fold to a raise.
Since he checked on 5th, obvious bet on 6th and 7th.