Embedding Fonts in EPUB- iPad

[matteino10]

Hello everyone I need your help.
I created an epub and inside it use the standard fonts (Times-Simoncini) with the addition of these two fonts:
JLSSmilesSampler.otf
Courier.otf

These two fonts are displayed on various types sony reader, .... but when I go to watch them on my Ipad not display anything (my font is substituted).
I found on the web reading here and I saw that one speaks of a file to be included in the META-INF folder (this is also noted on apple guide):

com.apple.ibooks.display-options.xml

I created this file and now actually reading the file on Ipad properly visualize all my fonts
but as if by magic I appear blank pages (1 .. 2 ... 3) at the end of each chapter that before someone can tell me where there were no wrong?

Matteino