// Subnavigation Fade in / Fade out

var TimeToFade = 500.0;

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);
}

function FadeStart() {
	fade('products2');
}

window.onload = FadeStart;

function products1() {
	document.getElementById('products2').style.visibility='visible';
	fade('products1');
	document.getElementById('products2').style.display='block';
	fade('products2');
}

function products2() {
	document.getElementById('products1').style.visibility='visible';
	fade('products2');
	fade('products1');
	document.getElementById('products2').style.display='none';	
}