I was in that room where there was a fireplace, and i pushed this skull button to activate this elevator and went down, but the elevator wont come back down, and the place is a dead end. All thats in the area is another elevator that goes up two levels where there is a chest with a monkey idol, but i cant get out of the place...

I have posted you a reply in the Gandelon message - sorry the news isn't any better.