var TimeToFade = 800;

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.FadeState == 1) //map visible
  {
	 alert("map visible")
    document.getElementById("map_canvas").style.display = "block";
	document.getElementById("map_container").style.zIndex = "101"; 
  }*/
  
  if(element.FadeTimeLeft <= elapsedTicks)
  {
	  
	 /*
	if(element.FadeState == -1)  //map faded
	{
		alert("map faded")
		GUnload(); //save up memory
		document.getElementById("map_canvas").style.display = "none";
		document.getElementById("map_container").style.zIndex = "-10";
	}*/
	
    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);
}