var TimeToFade = 800.0;

function fade(eid)
{

	var element = document.getElementById(eid);
	if(element == null)
	return;
	
	if(element.FadeState == null){
	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);
}