How does the table know what template to use?

[dilbert]

<font face="&quot">I have a table on a custom page that works perfectly as I designed it, but it's not what I want. I want the table to take on the elements of the theme when a user selects a different theme, not the one I hard coded in it.

Let's say for instance I have this:

<td width="21" height="31" align="left" valign="top" style="background-image: url(images/aria/misc/top_bg.gif)"><img border="0" src="forum/images/aria/misc/top_left.gif" width="21" height="31" alt="" /></td>

How can I write that so it's not going to that specific image, but is from the style itself?

Thank you,
Cliff</font>