Location Of Div Top And Left In Webpage

I have a footer that is appended to all of my web pages as an include. The
pages are different lengths of course so that location of the div in pixels
from the top of the page changes with each page. I need to access the
location of a div within this footer for reasons I won't go into. The footer
may of may not be nested inside other absolute divs, depending on the page.

This:

var obj = document.getElementById('BottomMenuDiv');
var xlocation = parseInt(obj.offsetLeft);
var ylocation = parseInt(obj.offsetTop);

will give me the location of the div inside it's parent div. I would like to
do something like this:

while (obj.parent)
{
obj = obj.parent;
xlocation = xlocation + parseInt(obj.offsetLeft);
ylocation = ylocation + parseInt(obj.offsetTop);
}

to go all the way to the top of the page. (Or is there some way to get the
divs absolute position without going through it's parents?) What would be
the syntax to do this?