Rails - Jun 2006 - Knowing the positions of Draggables

Could anyone direct me to a way to easily (without writing my own
JavaScript, if possible) track the X and Y positions of Draggable
objects moved/placed on a web page?  I''d like for users to be able to
reposition elements on a page, which I''ll then store the locations of
so
that I can redisplay them in the correct positions later.

Thanks.