$().offset() returns erroneous results in Chrome. Works perfectly on FF and IE

$().offset() returns erroneous results in Chrome. Works perfectly on FF and IE

Dear All,

var offset = $(node).offset();   // node provides the dom element of an SVG element .

I used to measure the absolute location of the node w.r.t the page top left corner. 
FF/IE works perfectly. But in chrome, I got (0,0). Is there a work around / fix for this?

Demo:  http://www.janapriya.net/vis/ Select Knobs tab. Knobs do not work in Chrome due to above issue.

thanks and regards,

Janapriya