Hi

Could you help me with the following question:
How do you make a flash full browser background with high quality like here:

http://www.golla.fi/
(Please, choose your language at first. After that opens up a screen with a full browser bitmap man on the left size.)

I have been trying to make such scalable high quality background image but the results have been poor. So, what is the trick? High resolution or what?

I am using Photoshop and Flex.