Since first onlinetesting for my webapp, i get curiouse commercials

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Hi Folks,

I have written a WebApp in Html5, css3 and jQuery mobile.
Than uploaded to bplaced and now i get commercial Banners over Most of other Websites. Whats wrong?

It might be a hint, i dont know:
In my WebApp i want to Programme a videolist (Content from json)
Where you can select One Video that than plays in popupwindow (jquery) with an embedded iFrame (The Videos Are in Youtube).

I think the Problem lies in security?!?
But wehre specific?

Tanks a Lot for s hint!
Best regards