var slideshow = new Array(3);

slideshow[0] = new Image();
slideshow[0].src = "http://koti.mbnet.fi/milones/lib/jpg.php?id=welcome";

slideshow[1] = new Image();
slideshow[1].src = "http://koti.mbnet.fi/milones/lib/jpg.php?id=welcome2";

slideshow[2] = new Image();
slideshow[2].src="http://koti.mbnet.fi/milones/lib/jpg.php?id=welcome3";

//slideshow[3] = new Image();
//slideshow[3].src="http://koti.mbnet.fi/milones/lib/jpg.php?id=welcome4";

//slideshow[4] = new Image();
//slideshow[4].src="http://koti.mbnet.fi/milones/lib/jpg.php?id=welcome5";


var timer;

function showImage(index) {
  if (document.images["welcome_image"]) {
    document.images["welcome_image"].src = slideshow[index].src;
    index++;
    if (index >= slideshow.length) {
      index = 0;
    }

    timer = setTimeout(function() { showImage(index) }, 5000);
  }
  else {
    clearTimeout(timer);
  }
}