offset() does not work in Chrome. Works in IE and FF

offset() does not work in Chrome. Works in IE and FF

$().offset() does not return values on Chrome. Works well in IE and FF. 

var element = r.circle(cx, cy, radius); // r.circle is from raphaeljs library.
var offset = $(element.node).offset(); 

Is there a work/fix around for this?
thanks and regards,

Janapriya

p.s. Here is my work. The knobs do not work in Chrome due to above issue