After Effects CS4
PDF (adobe.com)
Expressions
Expression elements reference
Using the expression elements reference
Global objects, attributes, and methods
Time conversion methods
Vector Math methods
Random Numbers methods
Interpolation methods
Color Conversion methods
Other Math methods
Comp attributes and methods
Footage attributes and methods
Layer Sub-objects attributes and methods
Layer General attributes and methods
Layer Properties attributes and methods
Layer 3D attributes and methods
Layer Space Transforms methods
Camera attributes and methods
Light attributes and methods
Effect attributes and methods
Mask attributes and methods
Property attributes and methods
Key attributes and methods
MarkerKey attributes