Here are three tables with different background colors inside "div"
tags that make them objects that can be positioned "absolutely" in relation to the upper left-hand corner and stacked on the "z" axis (front to back). Do a view source to see how this is done, but here is a sample. The code is "in-line" meaning within the body, not in the page head and it looks like this:
<div style="position:absolute; width:200px; height:115px; z-index:1; left:100px; top:100px;">TABLE CODE HERE</div>