Untitled

offsetParent() vs offsetParent
var $foo = jQuery('#foo');
var $fooOffsetParent = $foo.offsetParent();

document.getElementById("foo").offsetParent.offsetTop
document.getElementById("foo").offsetParent.offsetLeft

var $foo = jQuery('#foo'),
    foo = $foo.get(0),
    fooOffsetParent = foo.offsetParent;

var $foo = document.getElementById('foo');
var $fooOffsetParent = foo.offsetParent;

var $foo = $('#foo');
var $fooOffsetParent = foo.get(0).offsetParent;