No loading when embedding flash games on my website

I’m trying to embed a few flash games on my websites.
They are pretty heave for a flash game, around 5-15mb
and I’ve seen those games on a few websites so far, in all of them
the game displayed an intro screen with a loading bar, but when I am trying
to embed them on my website, I only see a white screen (just the background) untill the game is fully loaded and only then the game appears, displaying the menu right away instead of the loading first.
Do guys know what i am missing here?