Flip Book image size issue

[realtime158]

If you go to the following link here

http://demo.quietlyscheming.com/displayShelf/index.html

you will see that the flip book flips properly with the current image size but
when you change it to 600x400 the image flip doesn't work right.

Here is another link as to what i am talking about it shows the correct and
incorrect
http://www.p3x984.com/flp/

Any ideas as to why or what do i need to modify?

[zmc...@gmail.com]

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