gistfile1.js

/*!
* toggleAria.js
* Author: Joe Watkins
* usage:

  HTML
  <button aria-pressed="false">Show Content</button>

  $("button").on("click", function(){
    $(this).toggleAria({aria: "pressed"});
  });

*
*/
(function($){

    $.fn.toggleAria = function(options) {

        var defaults = {
          wrapper: this,
          aria: ""
        },

        options =  $.extend(defaults, options),
        o = options,

        currentState = $(o.wrapper).attr("aria-"+o.aria),
        newState;

        if(currentState == "false"){
          newState = "true";
        }else{
          newState = "false";
        }

        $(o.wrapper).attr("aria-"+o.aria,newState);

    }; // $.fn

}(jQuery));