var ImageFolder = ""; //Folder name containing the images
var ImageFileNames = new Array('/images/index_assets/ad_banner/banner_courses.jpg', '/images/index_assets/ad_banner/banner_patrick.jpg', '/images/index_assets/ad_banner/banner_exile.jpg', '/images/index_assets/ad_banner/banner_odyssey.jpg'); //List of images to use
var ImageURLs = new Array('involved/courses.htm', 'http://www.patrickwhitworth.co.uk', 'http://www.patrickwhitworth.co.uk/exile', 'http://www.youthodyssey.org.uk'); //List of hyperlinks associated with the list of images
var DefaultURL = '/site/aboutus/welcome'; //Default hyperlink for the Banner Ad
var DisplayInterval = 4; //Number of seconds to wait before the next image is displayed
var TargetFrame = ""; //Name of the frame to open the hyperlink into

var IsValidBrowser = false;
var BannerAdCode = 0;
var BannerAdImages = new Array(NumberOfImages);
var DisplayInterval = DisplayInterval * 1000;
var NumberOfImages = ImageFileNames.length;

if (ImageFolder.substr(ImageFolder.length - 1, ImageFolder.length) != "/" && ImageFolder != "") {
	ImageFolder += "/";
}

if (TargetFrame == '') {
	var FramesObject = null;
} else {
	var FramesObject = eval('parent.' + TargetFrame);
}

function InitialiseBannerAdRotator() {
	var BrowserType = navigator.appName;
	var BrowserVersion = parseInt(navigator.appVersion);
	if (BrowserType == "Netscape" && (BrowserVersion >= 3)) {
		IsValidBrowser = true;
	}
	if (BrowserType == "Microsoft Internet Explorer" && (BrowserVersion >= 4)) {
		IsValidBrowser = true;
	}
	if (IsValidBrowser) {
		TimerObject = setTimeout("ChangeImage()", DisplayInterval);
		BannerAdCode = 0;
		for (i = 0; i < NumberOfImages; i++) {
			BannerAdImages[i] = new Image();
			BannerAdImages[i].src = ' ' + ImageFolder + ImageFileNames[i];
		}
	}
}

function ChangeImage() {
	if (IsValidBrowser) {
		BannerAdCode = BannerAdCode + 1;
		if (BannerAdCode == NumberOfImages) {
			BannerAdCode = 0;
		}
		window.document.bannerad.src = BannerAdImages[BannerAdCode].src;
		TimerObject = setTimeout("ChangeImage()", DisplayInterval);
	}
}

function ChangePage() {
	if (IsValidBrowser) {
		if (TargetFrame != '' && (FramesObject)) {
			FramesObject.location.href = ImageURLs[BannerAdCode];
		} else {
			document.location = ImageURLs[BannerAdCode];
		}
	} else if (!IsValidBrowser) {
		document.location = DefaultURL;
	}
}

InitialiseBannerAdRotator();