var TimeToFade = 1000.0;

function animateFade(lastTick, eid, targetOpacity, time)
{  
  var curTick = new Date().getTime();
  var elapsedTicks = curTick - lastTick;
 
  var element = document.getElementById(eid);
 
  if(!targetOpacity){
	targetOpacity = element.FadeState == 1 ? '1' : '0';
  }
  if(!time){
    time = TimeToFade;
  }

  if(element.FadeTimeLeft <= elapsedTicks)
  {
    element.style.opacity = targetOpacity;
    element.style.filter = 'alpha(opacity = '
        + (targetOpacity * 100) + ')';
    element.FadeState = element.FadeState == 1 ? 2 : -2;
	if(targetOpacity == 0){
		element.style.display = 'none';
	}
    //element.style.display = element.FadeState == 2 ? 'block' : 'none';
    return;
  }
 
  element.FadeTimeLeft -= elapsedTicks;
  var delta = Math.abs(element.startOpacity - targetOpacity);
  var newOpVal = element.FadeTimeLeft/time * delta;
  if(element.FadeState == 1){
    newOpVal = targetOpacity - newOpVal;
	newOpVal += element.startOpacity;
  }else{
	newOpVal += element.startOpacity;
  }

  element.style.opacity = newOpVal;
  element.style.filter = 'alpha(opacity = ' + (newOpVal*100) + ')';
  setTimeout("animateFade(" + curTick + ",'" + eid + "'," + targetOpacity + ", " + time + ")", time/30);
}

function fade(eid)
{
//alert('asdf');
  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;
    element.startOpacity = element.style.opacity;
    setTimeout("animateFade(" + new Date().getTime() + ",'" + eid + "')", 33);
  }  
}

function fadeIn(eid, opacity, time)
{
  if(!opacity){
    opacity = 1;
  }
  if(opacity > 1){
    opacity = opacity / 100;
  }
  if(!time){
    time = TimeToFade;
  }
  var element = document.getElementById(eid);
  if(element == null)
    return;

  element.FadeState = 1;
  element.style.display = 'block';
  
  element.FadeTimeLeft = time;
  element.startOpacity = element.style.opacity;

  setTimeout("animateFade(" + new Date().getTime() + ",'" + eid + "', " + opacity + ", " + time + ")", time/30);
}

function fadeOut(eid, opacity, time)
{
//alert('asdf');
  if(!opacity){
    opacity = 0;
  }
  if(opacity > 1){
    opacity = opacity / 100;
  }
  if(!time){
    time = TimeToFade;
  }
  var element = document.getElementById(eid);
  if(element == null)
    return;

  element.FadeState = -1;
  
  element.FadeTimeLeft = time;
  element.startOpacity = element.style.opacity;
  setTimeout("animateFade(" + new Date().getTime() + ",'" + eid + "', " + opacity + ", " + time + ")", time/30);
}

function setOpacity(element, opacity)
{
  if(element.FadeState == 1 || element.FadeState == -1){
	return;
  }

  if(opacity > 1){
    opacity = opacity / 100;
  }
  element.style.opacity = opacity;
  element.style.filter = 'alpha(opacity = ' + (opacity*100) + ')';
}