//
// CSS Photo Shuffler v1.0 by
//   Carl Camera
//   http://iamacamera.org 
//
// SetOpacity Function and inpiration from Photo Fade by
//   Richard Rutter
//   http://clagnut.com
//
// License: Creative Commons Attribution 2.5  License
//   http://creativecommons.org/licenses/by/2.5/
//

// Customize your photo shuffle settings
// 
// * Surround the target <img /> with a <div>. specify id= in both
// * set background-repeat:no-repeat in CSS for the div
// * The first and final photo displayed is in the html <img> tag
// * The array contains paths to photos you want in the rotation. 
//   If you want the first photo in the rotation, then it's best to
//   put it as the final array image.  All photos must be same dimension
// * The rotations variable specifies how many times to repeat array.
//   images. zero is a valid rotation value.



var gblPhotoShufflerDivId = "headerImageHomeWrap";
var gblPhotoShufflerImgId = "headerImageHome"; 
var gblImg = new Array(
"/images/header_img_DavidNail.jpg",
"/images/header_img_CelticTenors.jpg",
"/images/header_img_EnterHaggis.jpg",
"/images/header_img_Hothouse.jpg",
"/images/header_img_Black47.jpg",
"/images/header_img_scottbrown.jpg"

);

// preload images
imageObj = new Image();
for(i=0; i<gblImg.length; i++) {imageObj.src=gblImg[i];}

var gblPauseSeconds = 6;
var gblFadeSeconds = .15;
var gblRotations = 10;

// End Customization section

var gblDeckSize = gblImg.length;
var gblOpacity = 100;
var gblOnDeck = 0;
var gblStartImg;
var gblImageRotations = gblDeckSize * (gblRotations+1);

window.onload = photoShufflerLaunch;

function photoShufflerLaunch()
{
var theimg = document.getElementById(gblPhotoShufflerImgId);
	gblStartImg = theimg.src; // save away to show as final image

document.getElementById(gblPhotoShufflerDivId).style.backgroundImage='url(' + gblImg[gblOnDeck] + ')';
setTimeout("photoShufflerFade()",gblPauseSeconds*1000);
}

function photoShufflerFade()
{
var theimg = document.getElementById(gblPhotoShufflerImgId);

// determine delta based on number of fade seconds
// the slower the fade the more increments needed
	var fadeDelta = 100 / (30 * gblFadeSeconds);

// fade top out to reveal bottom image
if (gblOpacity < 2*fadeDelta ) 
{
  gblOpacity = 100;
  // stop the rotation if we're done
  if (gblImageRotations < 1) return;
  photoShufflerShuffle();
  // pause before next fade
	  setTimeout("photoShufflerFade()",gblPauseSeconds*1000);
}
else
{
  gblOpacity -= fadeDelta;
  setOpacity(theimg,gblOpacity);
  setTimeout("photoShufflerFade()",30);  // 1/30th of a second
}
}

function photoShufflerShuffle()
{
var thediv = document.getElementById(gblPhotoShufflerDivId);
var theimg = document.getElementById(gblPhotoShufflerImgId);

// copy div background-image to img.src
theimg.src = gblImg[gblOnDeck];
// set img opacity to 100
setOpacity(theimg,100);

	// shuffle the deck
gblOnDeck = ++gblOnDeck % gblDeckSize;
// decrement rotation counter
if (--gblImageRotations < 1)
{
  // insert start/final image if we're done
  gblImg[gblOnDeck] = gblStartImg;
}

// slide next image underneath
thediv.style.backgroundImage='url(' + gblImg[gblOnDeck] + ')';
}

function setOpacity(obj, opacity) {
opacity = (opacity == 100)?99.999:opacity;

// IE/Win
obj.style.filter = "alpha(opacity:"+opacity+")";

// Safari<1.2, Konqueror
obj.style.KHTMLOpacity = opacity/100;

// Older Mozilla and Firefox
obj.style.MozOpacity = opacity/100;

// Safari 1.2, newer Firefox and Mozilla, CSS3
obj.style.opacity = opacity/100;
}