ok, i think I understand the problem here and I feel like an idiot...
so, and embedded game is already fullscreen in it's own page, right?
in any case, anyone can think on a way to make an embeded game turn fullscreen in it's parent page? :S probably not possible.
I'm thinking maybe i can use the game go to it's own page, so it's already fullscreen there, and when i want out of the fullscreen, go back to the previous page... that would mean reloading the game though, which is really far from ideal.