var interval = 5; // delay between rotating images (in seconds)
var random_display = 0; // 0 = no, 1 = yes
interval *= 1000;

var image_index = 0;
var done_random=0;
image_list = new Array();
image_list[image_index++] = new imageItem("images/boost.gif");
image_list[image_index++] = new imageItem("images/sprint_blackberry.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 (done_random==0) {
        image_index = generate(0, number_of_image-1);
        done_random = 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);
}