var imges = $$('#animation_content img').length;

function anime(i) {
  if (i >= imges) {
    i = 0;
  }
  x = i*140;
  animediv = $('animation_content');
  if (animediv.hasClass('pause')) {
    (function(){
      anime(i);
      return;
    }).delay(500);
    return;
  }
  new Fx.Scroll(animediv, {
    duration: 500,
    onComplete: function () {
      (function(){
        anime(i+1);
      }).delay(500);
    }
  }).start(x, 0);
}

$('animation_content').addEvents({
  mouseenter: function() {
    this.addClass('pause');
  },
  mouseleave: function() {
    this.removeClass('pause');
  }
});

anime(1);