var Slideshow = {
  FOTOS: 3,
  DELAY: 5000,
  SPEED: 2000,
  start: function () {
    var ss = document.getElementById("slideshow");
    var foto0 = document.getElementById("slideshow-foto-0");
    // "1.jpg" abschneiden
    var srcBase = foto0.src.substr(0, foto0.src.length - 5);

    for (var i = 1; i < Slideshow.FOTOS; i++) {
      var img = document.createElement("img");
      img.src = srcBase + (i + 1) + ".jpg";
      img.alt = foto0.alt;
      img.id = "slideshow-foto-" + i;

      img.style.display = i == 0 ? "block" : "none";

      ss.appendChild(img);
    }

    setTimeout(function () { Slideshow.next(0); }, Slideshow.DELAY);
  },

  next: function (c) {
    var n = (c + 1) % Slideshow.FOTOS;

    Slideshow.current = n;

    setTimeout(function () { $("#slideshow-foto-" + c).fadeOut(Slideshow.SPEED); }, 0);
    setTimeout(function () { $("#slideshow-foto-" + n).fadeIn(Slideshow.SPEED); }, 0);

    setTimeout(function () { Slideshow.next(n); }, Slideshow.DELAY);
  }
};

$(document).ready(Slideshow.start);