queue.js

$.fn.queue = function(){

  var Q = function(){
    this.q = [];
  }

  Q.prototype = {
    enqueue: function(el){
      if($.isArray(el)){
        this.q = el;
      } else {
        this.q.push(el);
      }
      return this.q;
    },
    queue: function(){
      var args = Array.prototype.slice.call(arguments, 0);
      if(args.length === 0){
        return this.q;
      } else {
        return this.enqueue.apply(this,args);
      }
    }
  }

  this.q = this.q || new Q();
  var args = Array.prototype.slice.call(arguments, 0);
  return this.q.queue.apply(this.q, args);
}