Like I mentioned earlier you can use styling sheets.
Code:
*/ Set margins to align Gmap.gif with background image */
div.Gmap {
background-image: url("http://www.url.com/images/Gmap.gif")
margin: 0px 0px 0px 0px;
z-index: 1;
*/ Adjust the z-index rendering accordingly */
}
Basicly what I am doing here is creating a second image that will be postioned over the area of the background that needs to be mapped.
In this case, the Gmap.gif will need to be positioned over your table aligned with the "G" in the background.