Lets Consider this is your table with className attribute as shown below
< table>
< tr>
< td class="img1">Text< /td>
< td class="img2">Text 2< /td>
< /tr>
< /table>
Then write Css like below:
.img1
{
background-image:url('images/back.jpg');
background-repeat:norepeat:
}
.img2
{
background-image:url('images/back2.jpg');
background-repeat:norepeat:
}