function startLinkedSlideshow(masterId, numimgs, timer, rnd, start) {
    var delay = timer + ( Math.random()*rnd)- (rnd/2)  // random length of time if rnd is non-zero
    window.setTimeout('cueNextSlide('+start+','+numimgs+',"'+masterId+'",0,'+timer+','+rnd+')', delay*1000);
}

function cueNextSlide(imgno, numimgs, masterId, tofront, timer, rnd) {
    var nextImg = (imgno  + 1 ) % numimgs;
    var frontId = masterId + '-front';
    var backId = masterId + '-back';
    var imgLinkId = masterId + "-Link";
    var imgLink = document.getElementById(imgLinkId);
    imgLink.href = linkURLs[imgno];

    var delay = timer + ( Math.random()*rnd)- (rnd/2);  // random length of time if rnd is non-zero
    if (!tofront) {
        window.setTimeout('changeimg("front","' + masterId + '","' + images[nextImg] + '","'+ altTexts[nextImg] + '")', delay*750);
        fade(backId,0.8, 'in');
        fade(frontId, 0.8, 'out');
        tofront = true;
    } else {
        window.setTimeout('changeimg("back","' + masterId + '","' + images[nextImg] + '","'+ altTexts[nextImg] + '")', delay*750);
        fade(frontId,0.8,'in');
        fade(backId,0.8,'out');
        tofront = false;
    }
    window.setTimeout('cueNextSlide('+nextImg+','+numimgs+',"'+masterId+'",'+tofront+','+timer+','+rnd+')', delay*1000);
}

function changeimg(layer, masterId, imgSrc, imgAlt) {
    var chgimgId = masterId + "-" + layer;
    var frontImgId = masterId + "-front";

    chgimg = document.getElementById(chgimgId);
    chgimg.src = imgSrc;

    frontImg = document.getElementById(frontImgId);
    frontImg.alt = imgAlt;
    frontImg.title = imgAlt;
}

function fade(img, time, dir)
{
  img = document.getElementById(img);
  var steps=time*10;
  if (typeof img.style.opacity != 'undefined')
  {
    var otype='w3c';
  }
  else if (typeof img.style.MozOpacity != 'undefined')
  {
    var otype='moz';
  }
  else if (typeof img.style.MKhtmlOpacity != 'undefined')
  {
    var otype='khtml';
  }
  else if (typeof img.filters =='object')
  {
    otype = (img.filters.length >0
      && typeof img.filters.alpha == 'object'
      && typeof img.filters.alpha.opacity == 'number')
      ? 'ie' : 'none';
  }
  else { otype = 'none';}
  if (otype != 'none')
  {
    if (dir == 'out') { dofade(steps,img,1,false,otype);}
    else { dofade(steps, img, 0, true, otype); }
  }
}
function dofade(steps, img, value, targetvisibility, otype)
{
  value += (targetvisibility ? 1 : -1) / steps;
  if (targetvisibility ? value >1 : value <0)
    value = targetvisibility ? 1:0;

  setfade(img,value,otype);
  if (targetvisibility ? value <1 : value >0)
  {
    setTimeout(function()
    {
      dofade(steps, img, value, targetvisibility, otype);
    }, 100);
  }
}
function setfade(img,value, otype)
{
  switch(otype)
  {
    case 'ie':
      img.filters.alpha.opacity = value * 100;
      break;
    case 'khtml':
      img.style.KhtmlOpacity = value;
      break;
    case 'moz':
      img.style.MozOpacity = (value==1?0.9999999 : value);
      break;
    default:
      img.style.opacity = (value == 1?0.9999999 : value);
  }
}