// Opacity and Fade in script.
// Script copyright (C) 2008 http://www.cryer.co.uk/.
// Script is free to use provided this copyright header is included.

//set variables- src is an array o fimage names, srcfolder is the folder where they are found and duration is the time in seconds for which each image will display.

src = ["hdr1.png", "hdr2.png", "hdr4.png", "hdr6.png", "hdr8.png", "hdr13.png", "hdr14.png", "hdr15.png", "hdr16.png", "hdr17.png", "hdr18.png", "hdr19.png", "hdr20.png", "hdr21.png", "hdr22.png", "hdr23.png", "hdr24.png"];
srcfolder = "tbar/";
duration = 17;

function SetOpacity(object,opacityPct)
{
  // IE.
  object.style.filter = 'alpha(opacity=' + opacityPct + ')';
  // Old mozilla and firefox
  object.style.MozOpacity = opacityPct/100;
  // Everything else.
  object.style.opacity = opacityPct/100;
}

function ChangeOpacity(id,msDuration,msStart,fromO,toO)
{
  var element=document.getElementById(id);
  var opacity = element.style.opacity * 100;
  var msNow = (new Date()).getTime();
  opacity = fromO + (toO - fromO) * (msNow - msStart) / msDuration;
  if (opacity < 0)
    SetOpacity(element,0)
  else if (opacity > 100)
    SetOpacity(element,100)
  else
  {
    SetOpacity(element,opacity);
    element.timer = window.setTimeout("ChangeOpacity('" + id + "'," + msDuration + "," + msStart + "," + fromO + "," + toO + ")",1);
  }
}

function FadeIn(id)
{
  var element=document.getElementById(id);
  if (element.timer) window.clearTimeout(element.timer);
  var startMS = (new Date()).getTime();
  element.timer = window.setTimeout("ChangeOpacity('" + id + "',1000," + startMS + ",0,100)",1);
}

function FadeOut(id)
{
  var element=document.getElementById(id);
  if (element.timer) window.clearTimeout(element.timer);
  var startMS = (new Date()).getTime();
  element.timer = window.setTimeout("ChangeOpacity('" + id + "',1000," + startMS + ",100,0)",1);
}

function FadeInImage(foregroundID,newImage,backgroundID)
{
  var foreground=document.getElementById(foregroundID);
  if (backgroundID)
  {
    var background=document.getElementById(backgroundID);
    if (background)
    {
      background.style.backgroundImage = 'url(' + foreground.src + ')';
      background.style.backgroundRepeat = 'no-repeat';
    }
  }
  SetOpacity(foreground,0);
  foreground.src = newImage;
  if (foreground.timer) window.clearTimeout(foreground.timer);
  var startMS = (new Date()).getTime();
  foreground.timer = window.setTimeout("ChangeOpacity('" + foregroundID + "',1000," + startMS + ",0,100)",10);
}

oldimg = Math.floor(Math.random()*src.length);
nowimg = oldimg;
newimg = Math.floor(Math.random()*src.length);
while(oldimg == newimg || nowimg == newimg)
{
  newimg = Math.floor(Math.random()*src.length);
}

//Please do not edit below
pics=[];

function switchPic()
{
  if (pics[nowimg] && (pics[nowimg].complete || pics[nowimg].complete==null))
  {
	FadeInImage('headerimg',pics[nowimg].src,'headerbgd')
  }
  pics[newimg] = new Image;
  pics[newimg].src = srcfolder + src[newimg];
  oldimg = nowimg;
  nowimg = newimg;
  newimg = Math.floor(Math.random()*src.length);
  while(oldimg == newimg || nowimg == newimg)
  {
    newimg = Math.floor(Math.random()*src.length);
  }
  pictime = duration-3+Math.floor(Math.random()*6)
  setTimeout("switchPic()",pictime*1000);
}

onload = function()
{
  if (document.images) switchPic();
}