Ad-hoc jQuery Ajax Queue

gistfile1.js

function AjaxQueue () {
   this.q = [];
}
AjaxQueue.prototype = {
   push: function (options) {
      options = $.extend({'complete': function () {}}, options);
      var originalComplete = options.complete
      var qa = this;

      options.complete = function () {
         qa.q = qa.q.slice(1);
         originalComplete.apply(this.last, arguments);

         if (qa.q.length) {
            qa.last = jQuery.ajax(qa.q[0]);
         }
      }

      qa.q.push(options);

      if (qa.q.length == 1) {
         qa.last = jQuery.ajax(options);
      }
   }
};