I have no idea (I don`t know how an euro-adapter for a DVD player looks like) - but I don`t think that a Tv can recognize the regional code (well perhaps some of the newest plasma tv`s can)- the Tv is just the display and it recives the video-signal from the DVD as if it would recive the same way signal from a camera or any other device.
Poland so the Dvd's are recorded in the "Polish system".
Yes - and Polish DVD can be played in most cases all over the world without any problem. But I`m affraid that it`s not the case with most American DVDs :)