Well I am unclear as to what you're looking for so here are 2 solutions to the different variations of how I interperet your question.
1. You want an image across the whole background of the table.
http://www.w3schools.com/html/tryit....ble_background
Go there and it shows you two possible codes.
2. You want it in one or a few cells only.
http://www.w3schools.com/html/tryit....cellbackground
Go there and it will show you another 2 possible codes.
As a side note this is a basic step in any tutorial you should go over the one at w3schools.com to start off.