What you ask is that there is a background image on the body, the body contains a div that has a white background color.
And then you need a div inside this div that is viewing the background image? It's impossible.
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:
http://jsfiddle.net/aFpAX/
jQuery
div position(), background-position :
$(function(){
var pos = $('#window').position();
$('#window').css('background-position','-'+pos.left+'px -'+pos.top+'px');
});
:
http://jsfiddle.net/aFpAX/2/