// JavaScript Document
var image1=new Image()
image1.src="/images/scrollimg1.jpg"
var image2=new Image()
image2.src="/images/scrollimg2.jpg"
var image3=new Image()
image3.src="/images/scrollimg3.jpg"
var image4=new Image()
//image4.src="/info/documents/OpenHouse2011.jpg"
image4.src="/images/scrollimg4.jpg"

//variable that will increment through the images
var step=1
var prevstep=4
var elmt;

function slideit(){
//if browser does not support the image object, exit.
if (!document.images)
return
document.images.slide2.src=eval("image"+prevstep+".src")
document.images.slide1.src=eval("image"+step+".src")
elmt=document.getElementById("slide1");
elmt.style.opacity=0;
elmt.style.filter = 'alpha(opacity = ' + (0) + ')';
elmt.FadeState= -2;
fade("slide1")
if (step<4)
step++
else
step=1
if (prevstep<4)
prevstep++
else
prevstep=1
//call function "slideit()" every 8 seconds
setTimeout("slideit()",8000)
}


var TimeToFade = 1000.0;

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);
}