gistfile1.js

// create an overlay off the jquery object
$('mydiv').geluiOverlay(opts).css(...); // keep on chaining

// get the instance of the overlay back
myOverlay = $('mydiv').data('geluiOverlay');

// or

// get the instance of the overlay bac
myOverlay = $('mydiv').geluiOverlay('instance'); // no chain

gistfile2.js

// create an instance from a constructor
myOverlay = new gelui.Overlay(opts);

// get the jquery object from the instance and start chaining
myOverlay.$.css(...); // chain here

// or

// get the jquery object from the instance and start chaining
myOverlay.element.css(...);