Thx a lot for your answer, it seems like I have done some mistakes with the google site gadget.
This message happen when I tried to paste the iframe code from TimelineJS to an html zone, that didn't worked.
After I tried to include it in a iframe gadget, that didn't work but no it's ok, I don't really know why. And it works well and it's great:
I tried to download the font you use as Bevan and Potano, I didn't succed in, it's seems to be your creation well done. Whatever I manage something else, but if you plan to open the download of your nice fonts, many people will surely be happy;)
Thx
Jonathan LANDAIS