function changeOpac(opacity, id)
{

	var object = document.getElementById(id).style;
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.KhtmlOpacity = (opacity / 100);
	object.filter = "alpha(opacity=" + opacity + ")";
}

function blendimage(divid, imageid, imagefile, millisec)
{
	var speed = Math.round(millisec / 2);
	var timer = 0;

	document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";

	changeOpac(0,imageid);

	document.getElementById(imageid).src = imagefile;

	for(i = 0; i <= 100; i++)
	{
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	}
}

var slideCache = new Array();

function RunSlideShow(divid,imageid,imageFiles,displaySecs)
{
	var imageSeparator = imageFiles.indexOf(";");
	var nextImage = imageFiles.substring(0,imageSeparator);

	changeOpac(0, imageid);

	blendimage(divid,imageid,nextImage,100);

	var futureImages = imageFiles.substring(imageSeparator+1,imageFiles.length)+ ';' + nextImage; 
	setTimeout("RunSlideShow('"+divid+"','"+imageid+"','"+futureImages+"',"+displaySecs+")",displaySecs*1000); 

	imageSeparator = futureImages.indexOf(";"); 
	nextImage = futureImages.substring(0,imageSeparator); 

	if (slideCache[nextImage] == null) 
	{ 
		slideCache[nextImage] = new Image; 
		slideCache[nextImage].src = nextImage; 
	} 
}


function IndexAd () {
	var divid = "adscreen";
	var imageid = "indxad";
	var imageFiles = "images/huntingdon-salsa-classes.jpg;images/salsa-dancing.jpg;images/salsa-dancing-1.jpg;images/salsa-dancing-2.jpg;images/salsa-dancing-3.jpg;images/salsa-dancing-4.jpg;images/salsa-dancing-5.jpg;images/salsa-dancing-6.jpg;images/salsa-dancing-7.jpg";
	var displaySecs = 5;
	RunSlideShow(divid,imageid,imageFiles,displaySecs)
}