I don't use dreamweaver but you should be able to insert code into one cell to control the no-repeat.
There are several ways but here are two:-
Put the background directly into the cell, rather than in the table as a whole:-
<td style="background-image: url(image.jpg); background-repeat: no-repeat;">cell text</td>
See http://www.w3schools.com/css/pr_background-repeat.asp
Or create a class for the td cell(s) if you want more than one to have the background:-
Put this inside the head section:-
<style type= "text/css">
.cellbackground { background-image: url(image.jpg); background-repeat: no-repeat; }
</style>
and this in the html markup:-
<td class="cellbackground">cell text</td>
Code downloaded to my PC will be deleted in due course.
WIN7; IE9, Firefox, Opera, Chrome and Safari for Windows; screen resolution usually 1366*768.
Also IE6 on W98 with 800*600 and IE8 on Vista 1440*900.