// Bornhorst + Ward website javascript
//coded by Rod Howarth http://rodhowarth.com


//set time for fade animation
var TimeToFade = 1000.0;
var TimeBetweenFades = 8000;
//timer to schedule fading
var timer;
//status of pic, faded or not
var faded = 0;
//current pic in the array
var currentPic = 0;
//array of pics
var picturesToScroll = new Array();
var pictureNames = new Array();


//controller of fading, calls fade and sets faded property.
function fadeController(eid, imageCaption) {

    //fade image
    fade(eid);
    
    //if the image wasn't faded, set it to be faded, change image and schedule fade in
    if (faded == 0) {
      
      //schedule image change for when fading is done
      setTimeout("changeImage('" + eid + "', '" + imageCaption + "')", TimeToFade);
   
      //schedule fade in 
      timer=setTimeout("fadeController('" + eid + "', '" + imageCaption + "')", 1500);
      
      //image is now faded
      faded=1;
    
    
    } else {
      //image was faded in, schedule fade out 
      timer=setTimeout("fadeController('" + eid + "', '" + imageCaption + "')", TimeBetweenFades);
      
      // set it as not faded
      faded=0;
    }


}


//changes image currently displayed
function changeImage(eid, imageCaption) {

    //increment  current pic
    currentPic++;
    
    //if it's end of array, reset
    if (currentPic >= picturesToScroll.length) {
    currentPic = 0;
    }
   
    //set the image source
    var element = document.getElementById(eid);
    element.src =  picturesToScroll[currentPic];
  
   // alert(picturesToScroll[currentPic]);
    //set the caption
  //  var caption = document.getElementById(imageCaption);
   // caption.innerHTML = pictureNames[currentPic];
   
   }

//function fades
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 animates the fading
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);
}