A moving background can be achieved
by careful use of a continuously scrolling image and a mask.
Start a new flash movie and rename the default first layer as background.
Use the flash drawing tools to create a simple background picture
on the background layer. The key to a successful
scrolling background is to make sure that the left and right edge
To speed things up, you could download and load the sample flash
file from here and
copy the symbol called picture from its library.
Please excuse the graphics!