this is online nl25, not the world series of poker

first of all original miniraise means absolutely nothing. many players online miniraise with any 2 suited cards, ace rag, etc.

as for the second reraise preflop, it means he is is holding some sort of hand and trying to isolate. could be anything from 22-aa, a9-ak, two broadways, (or even worse, depending on the player). I've seen some of the worst cases of poker at these tables so that reraise shouldn't worry you at all. Only hand you fear right now is aces and the chances of him holding that are only a fraction of a percennt.

putting in a nice sized reraise preflop is a good idea. first of all it will isolate the pot as most others wont call a 3 raises pot pf w/ rags (though some do) and it may even take the pot right there which isn't too bad

come out raising that flop too. that is a must.