Topic awaiting preservation: What am I laying on?

I was wondering if there is a way to dynamically determine elements physically below a div layer.
The div layer is absolutely positioned and none of the elements are children nodes of the div. I guess I could go through the DOM doc and compare top,left, right (left+width) and bottom(top+height) dims of each element with the dim of the div, but I'm wondering if there is another way. Any ideas?

Well, using Element.nextSibling (i think, or maybe Element.followingSibling), you should be able to access the next element in the *source*. But if you have a bunch of absolutely positioned elements at random positions, you'll have to compare their positions manually.