Defining Adobe Flash button states

1.Up frame
This is how the button displays when the user hasn’t yet interacted with it
2.Over frame
This is how the button should display when the user is just about to select it (ie when the pointer is touching the button without the mouse being clicked yet)
3. Down frame
This is how the button should display after the user selects it.
4.Hit frame
This is the area that should be responsive to any clicks by the user Hit frame definition is optional. This comes useful for small buttons and for graphic areas that are not contiguous. If the hit frame is not specified, the image for your Up state is used instead.