One attempt using tables looked like this. Another attempt using style sheet attributes looked like this. Consider changing the table images to move in "directions".

• Create a table 8 X 8
• Place all "blanks" in the table.
• Place a button on the page
• Onclick place your image randomly in one of the 64 cells
• Then start animating following these rules:
  • Set a global direction variable to 0
  • Now, randomly select a new direction (a number from -4 to 4) where 0 means don't move, -4 means move up and back, ...

    -4	-3	-2
    -1	0	1
    2	3	4

  • IF valid, move otherwise select again
• Call your function recursively