Event.observe(window, "load", initCarousel);

function initCarousel() {
  var carousel = new Carousel("small-carousel", {numVisible:4,size:15,url: null, buttonStateHandler: buttonStateHandler, animParameters: {duration: 0.5}});
}

function buttonStateHandler(button, enabled) {
  if (button == "prev-arrow")
    $('prev-arrow').src = enabled ? "img/revista/left-enabled.gif" : "img/revista/left-disabled.gif"
  else
    $('next-arrow').src = enabled ? "img/revista/right-enabled.gif" : "img/revista/right-disabled.gif"
}