docs: function (animId) {
                  var animInfo = this.animations[animId];
                  if (animInfo && !animInfo.isRunning) {
                      var offset = (new Date()).getTime() - animInfo.pauseTime;
                      animInfo.start += offset;
                      animInfo.end += offset;
                      animInfo.isRunning = true;
                      var id = setInterval(function (that) {
                          return function () {
                              that._interpolate.call(that, animInfo);
                          };
                      }(this), animInfo.interval);
                      animInfo.timingId = id;
                      return true;
                  }
                  return false;
              }