This is a horizontal toolbar.  Crossfades take 100 milliseconds.

There are 4 strips.
Strip 0 gives images for buttons 0,1,2,3,4 when their state is active.
Strip 1 gives images for buttons 1,3 when their state is mouse over.
Strip 2 gives images for buttons 1,3 when their state is clicked.
Strip 3 gives mouse-masks for buttons 1,3