Sliding-Tile Demo Using CSS from Jamie Wong's Version of the Fifteen Puzzle
    See 
	Jamie's AI-based solution
    to the classic Fifteen Puzzle.
    The graphic appearance of this puzzle is built solely from DIVs and CSS.
    Another implementation of the puzzle (without automated solutions)
    is on the
    
	Ultimate Game Solutions website,
    but it is not as pretty.
    Neither of these two implementations actually move DIVs in their
    containing NodeLists.
    Instead, they merely change the left or top
    property of a DIV's style.
    Jamie's moving DIVs have their position property set to
    absolute,
    but Ultimate Game Solutions has their position property set to
    fixed.
    There are other implementations of the Fifteen Puzzle
    (with and without automatic solvers) that are built from TABLEs and CSS.
    
    A test of Zen's direct-manipulation interface (DMI) will be whether
    a user can use it to move the cells to solve the puzzle.
    Not enough of the DMI has been coded to make this possible yet.
    
    
	
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