code: function(id){
          var i = qq.indexOf(this._queue, id);
          this._queue.splice(i, 1);
                  
          var max = this._options.maxConnections;
          
          if (this._queue.length >= max && i < max){
              var nextId = this._queue[max-1];
              this._upload(nextId, this._params[nextId]);
          }
      }
docs: Removes element from queue, starts upload of next