var  TimeToFade = 4500.0;
eid1 = 'img1';
eid2 = 'img2a';
state1 = 2;
state2 = -2;

function scheduleFade () {
  i = setTimeout("fade(eid1, state1)", 100);  
  j = setTimeout("fade(eid2, state2)", 3500);  
}

function fade(eid, state) {

  var element = document.getElementById(eid);
  if(element == null)
    return;
   
  element.FadeState = state; 
/*  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);
}