3
I'd reccomand you to use firefox, and to install the developer extension. With that one, you can select "outline table elements", and see the pieces you are trying to puzzle together.
Quick todo list:
1) Make sure the background image is repeatable in both x and y direction.
2) Make sure the background is not part of any of your other pictures, as it will be impossible to align them.
3) Recut those picture-parts that not aligned in the outlined table elements.
Good luck.
Best regards,
Daigoro