what part of a jQuery event object points to where the mouse is over?

what part of a jQuery event object points to where the mouse is over?

Fill in the missing part:
  1. (function($)
  2. {
  3.     $(document).mousemove(function(e)
  4.     {
  5.         //Code here to find out which element the mouse is over
  6.     });
  7. })(jQuery)

What do I use to get the element the mouse is current on top of?