nPlus = 5   //the % of fading for each step
speed = 2  //the speed

// You don't have to edit below this line
nOpac = 100

var TimeToFade = 1000.0;
var NextFade = 5000.0;

function fade(eid)
{
  var element = document.getElementById(eid);
  if(element == null)
    return;

  if(element.FadeState == null)
  {
    if(element.style.opacity == null 
        || element.style.opacity == '' 
        || element.style.opacity == '1')
    {
      element.FadeState = 2;
    }
    else
    {
      element.FadeState = -2;
    }
  }
    
  if(element.FadeState == 1 || element.FadeState == -1)
  {
    element.FadeState = element.FadeState == 1 ? -1 : 1;
    element.FadeTimeLeft = TimeToFade - element.FadeTimeLeft;
  }
  else
  {
    element.FadeState = element.FadeState == 2 ? -1 : 1;
    element.FadeTimeLeft = TimeToFade;
    setTimeout("animateFade(" + new Date().getTime() + ",'" + eid + "')", 33);
  }  
}

function animateFade(lastTick, eid)
{  
  var curTick = new Date().getTime();
  var elapsedTicks = curTick - lastTick;
  
  var element = document.getElementById(eid);
 
  if(element.FadeTimeLeft <= elapsedTicks)
  {
    element.style.opacity = element.FadeState == 1 ? '1' : '0';
    element.style.filter = 'alpha(opacity = ' + (element.FadeState == 1 ? '100' : '0') + ')';
    element.FadeState = element.FadeState == 1 ? 2 : -2;
    return;
  }
 
  element.FadeTimeLeft -= elapsedTicks;
  var newOpVal = element.FadeTimeLeft/TimeToFade;
  if(element.FadeState == 1)
    newOpVal = 1 - newOpVal;

  element.style.opacity = newOpVal;
  element.style.filter = 'alpha(opacity = ' + (newOpVal*100) + ')';
  
  setTimeout("animateFade(" + curTick + ",'" + eid + "')", 33);
}

var currentIndex = scrollImages.length - 1;

function setupFades()
{
  //make sure all the images are faded out, excepting the last one, which is initially visible
  for(var i = 0; i < (scrollImages.length-1); i++)
  {
    var id = 'img' + i;
    fade(id);
  }
  
  setTimeout("startFade()", NextFade);
}

function startFade()
{
  var next = currentIndex + 1;
  if(next == scrollImages.length)
    next = 0;
    
  //fade out current img
  fade('img' + currentIndex);
  //fade in next img
  fade('img' + next);
  
  currentIndex = next;
  
  //set the timer on the next fade in 
  setTimeout("startFade()", NextFade);
}