gistfile1.js

function startAnimation() {
            // empezar animacion
  if (scope.isAnimated) {
    timeFunctions.$clearInterval(scope.animateTimeout);
  }
  scope.animateTimeout = timeFunctions.$setInterval(animateBg, scope.Animation.speed, scope);
}

function animateBg() {
// camibar la pos de BG para la animacion
  element.css({'backgroundPosition': calcBgPosition(stickyInfo.index, stickyInfo.nRows, stickyInfo.nCols, stickyInfo.nFrames, stickyInfo.width, stickyInfo.height)});
                
  stickyInfo.index++;
}