I had Jack stuck between screens 15307 and 15308. I think he is to go up to the screen above 15307 but I can't get him up there. A piece of him was visible one each screen. By jumping I could kill him by falling onto roof in 15307. Had 22 lives and used them all trying to reach upper screen. Someone tell me the trick. Please.

You're not supposed to travel directly between the 2 rooms. There's a different way to get up to the roof in 15307 to get the money. Approach from a different direction and do some jumping. Look for subtle clues to find where to jump to get up there.