//User defined variables 

var ImagesFolder = "jpgindex/";                                       

var Images_JPG = new Array(
'001.jpg',
'002.jpg',
'003.jpg',
'004.jpg'
);  
 
var DisplayInterval = 8; //Number of seconds to wait before the next image is displayed

//Internal variables (do not change these unless you know what you are doing)

var IsValidBrowser = false;
var BannerIndex = 0;
var BannerNumImages = Images_JPG.length;
var DisplayInterval = DisplayInterval * 1000;

//Function runs when this page has been loaded and does the following:
//1. Determine the browser name and version  (since the script will only work on Netscape 3+ and Internet Explorer 4+).
//2. Start the timer object that will periodically change the image displayed by the Banner Ad.
//3. Preload the images used by the Banner Ad rotator script
function InitialisebannerRotator() {

//Determine the browser name and version
//The script will only work on Netscape 3+ and Internet Explorer 4+
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);
BannerIndex = 0;

}
}

//Function to change the src of the Banner Ad image
function ChangeImage() {

BannerIndex = Math.floor(Math.random()*Images_JPG.length);

if (BannerIndex >= BannerNumImages) {
BannerIndex = 0;
}

window.document.banner.src = ImagesFolder + Images_JPG[BannerIndex];
TimerObject = setTimeout("ChangeImage()", DisplayInterval);
}

InitialisebannerRotator();