diff pattern for plugin

http://coding.smashingmagazine.com/2011/10/11/essential-jquery-plugin-patterns/

defaults and settings/option

http://www.learningjquery.com/2009/03/making-a-jquery-plugin-truly-customizable

http://blog.jeremymartin.name/2008/02/building-your-first-jquery-plugin-that.html