There would be nothing you could do in your browser that would cause that
layer to move from its position -
<div style="position: absolute; width: 529px; height: 265px; z-index: 1;
left: 282px; top: 271px" id="layer1">
It will always be 282pixels from the left margin and 271 from the top
margin.
On the other hand, this -
<p align="center">
<img border="0" src="background%20copy.jpg" width="760" height="600"></p>
is going to be loosy goosy all over the screen (note the centering
paragraph).
I'm guessing the only reason you used the layer would have been to position
the text.
If you had used a centering table instead with that image as the table's
background, you wouldn't have this problem, no?