//These fading functions taken from http://blog.paranoidferret.com/index.php/2007/12/20/javascript-tutorial-simple-fade-animation/
//The script has been slightly modified to accommodate browser detection via PHP to determine which CSS properties to use for the opacity, and for use with
//the Prototype Javascript framework and the script.aculo.us library.

var TimeToFade = 1000.0;

function fadeX(eid,hidden)
{
  var element = $(eid);
  if(element == null)
    return;
  
  var browser = "firefox";
  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
  {
   if(hidden != null)
    {
	 if(hidden && element.FadeState == -2)
	   return;
	}
   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 = $(eid);
 
  if(element.FadeTimeLeft <= elapsedTicks)
  {
    element.style.opacity = element.FadeState == 1 ? '1' : '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; 
  setTimeout("animateFade(" + curTick
      + ",'" + eid + "')", 33);
}