The iframe resizes but the video is not correct by centering. Look at the video.
[iframe src="http://www.panorama.airpics.org/tour_hafenresidenz/index.html" width="960px" height="400px"]
However if we remove the height and set the width to 100% it does but the height is not correct.
[iframe src="http://www.panorama.airpics.org/tour_hafenresidenz/index.html" width="100%"]
But if we set the height to 100% and add a div around the iframe with a height of 400px it seems to work and keep the room better in focus.
<div style="height:400px;">
<iframe width="100%" frameborder="0" seamless="seamless" style="width:100%;height:100%;" src="http://www.panorama.airpics.org/tour_hafenresidenz/index.html"> </iframe>
</div>