var TimeToFade = 1000.0;

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

	element.changeType = changeType;
	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;
		if(element.changeType == 'open'){
			element.style.display = element.FadeState == 1 ? 'block' : 'none';
		}
		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') + ')';
		if(element.changeType == 'close'){
			element.style.display = element.FadeState == 1 ? 'block' : 'none';
		}
		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(function() {animateFade(curTick, eid)}, 33);
}