How to draw scrolling background?

How should I adjust the background-position on my website with Parallax Scrolling to look good on iPad?

http://bit.ly/1s6SD75 On Firefox the background-images are displayed in the correct way (at least on my pc's here) when I use background-size:100% auto; On my iPad I can see only the first picure and the others are hidden. They are visible if I use background-size: cover, but then they are stretched over the whole website-length. I think the Safari-browser just takes the whole site-size and not only the screen size. I can't figure out what the problem is.
Answer:

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