Thank you it's just what I was looking for.
An other question, do you know site, which have advanced way of using this feature?
We are surfing so often centered fixed flash site, that I wonder if there's a point why not use this feature more intensively...
Is there restrictions using this feature, is there browser or platform compatibility bugs known?
I found a sample file about this subject made by our peer Colin Moock, I'm sure it will help someone else:
Thank you in advance for your help!