pgaes not working properly

I've got a flipper page book (from http://www.iparigrafika.hu/pageflip). It all works fine, but when I add my own pages and follow the instructions for doing so it doesn't work proberly. If I roll over the right top corner then bottom left corner turns up as well and vice versa. I've looked at the code, but don't really understand which bit would control it. I've attached the code that was in the file.
Thanks