Range: floating point number greater than zero
Determines the speed by which the clouds move. Speed is also affected by the length property, since the entire animation always plays exactly once during the duration of the clip.
Typically bound to a Slider control.
backcolor: six character hex color value
direction: right, left, up, down, upright, upleft, downright, downleft
editable: comma delimited list of property names
forecolor: six character hex color value
id: single word string identifier, starting with a letter
length: floating point number (frames)
quality: integer value
speed: floating point number greater than zero
symbol: a valid SWF URL, followed by an ampersand and class name
type: the string 'theme'