// Written by: Debbie Whitcomb
// Last Updated: January 14, 2004

// $Author: Northrop Grumman Corp. $ 
// $Revision:  $ 

// Original:  Robert Bui (astrogate@hotmail.com)           //
// Web Site:  http://astrogate.virtualave.net              //
//                                                         // 
// This script and many more are available free online at  //
// The JavaScript Source!! http://javascript.internet.com  //
 
var interval = 6; // delay between rotating images (in seconds)
var random_display = 1; // 0 = no, 1 = yes
interval *= 1000;

var image_index = 0;
image_list = new Array();
image_list[image_index++] = new imageItem("/images/HELPTruckwCaptionSmall.jpg");
<!-- image_list[image_index++] = new imageItem("/images/TMCControlRoomwCaptionSmall.jpg"); -->
image_list[image_index++] = new imageItem("/images/VMSWebSiteURLwCaptionSmall.jpg");
image_list[image_index++] = new imageItem("/images/TSPAerialwCaptionSmall.jpg");
image_list[image_index++] = new imageItem("/images/TSPwCaptionSmall.jpg");
var number_of_image = image_list.length;

function imageItem(image_location) {
  this.image_item = new Image();
  this.image_item.src = image_location;
}

function get_ImageItemLocation(imageObj) {
  return(imageObj.image_item.src)
}

function generate(x, y) {
  var range = y - x + 1;
  return Math.floor(Math.random() * range) + x;
}

function getNextImage() {
  if (random_display) {
    image_index = generate(0, number_of_image-1);
  } else {
    image_index = (image_index+1) % number_of_image;
  }
  var new_image = get_ImageItemLocation(image_list[image_index]);
  return(new_image);
}

function rotateImage(place) {
  var new_image = getNextImage();
  document[place].src = new_image;
  var recur_call = "rotateImage('"+place+"')";
  setTimeout(recur_call, interval);
}