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 / 10);
	var timer = 0;
	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";

	//make image transparent
	changeOpac(0, imageid);

	//make new image
	document.getElementById(imageid).src = imagefile;

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

var slideCache = new Array();
var nextImageFiles = "";
var nextBannerLinks = "";
var playLock = false;
function runSlideShow(divid,imageid,imageFiles,bannerLinks,displaySecs) {
	playLock = false;		// this is used to make sure we don't start another slideshow while this one is running;
	if(playing) {
		playLock = true;
		var imageSeparator = imageFiles.indexOf(";");
		var linkSeparator = bannerLinks.indexOf("|");
		var nextImage = imageFiles.substring(0,imageSeparator);
		var nextLink = bannerLinks.substring(0,linkSeparator);
		changeOpac(0, imageid);
		document.getElementById("bannerform").action=nextLink;
		document.getElementById("clickbanner").value=nextImage;
		blendimage(divid,imageid,nextImage,100);
		var futureImages= imageFiles.substring(imageSeparator+1,imageFiles.length)+ ';' + nextImage;
		var futureLinks= bannerLinks.substring(linkSeparator+1,bannerLinks.length)+ '|' + nextLink;
		setTimeout("runSlideShow('"+divid+"','"+imageid+"','"+futureImages+"','"+futureLinks+"',"+displaySecs+")",displaySecs*1000);

		// Cache the next image to improve performance.
//		imageSeparator = futureImages.indexOf(";");
//		nextImage = futureImages.substring(0,imageSeparator);
//		if (slideCache[nextImage] == null){
//			slideCache[nextImage] = new Image;
//			slideCache[nextImage].src = nextImage;
//		}		
	} else {
		nextImageFiles = imageFiles;
		nextBannerLinks = bannerLinks;
	}


}
var playing = true;
function playPause(divid,imageid) {
	if(playing) {
		playing = false;
		document.getElementById("playpauseimg").src = "/images/playbutton.png";
	} else {
		playing = true;
		document.getElementById("playpauseimg").src = "/images/pausebutton.png";
		startSlideShow(divid,imageid);
	}
}

function startSlideShow(divid,imageid) {
	if(playLock) {
		setTimeout("startSlideShow('"+divid+"','"+imageid+"')",100);
	} else {
		if(playing) {runSlideShow(divid,imageid,nextImageFiles,nextBannerLinks,3);}
	}
}

function bannerSubmit(n) {
	document.getElementById("bannerform"+n).submit();
}