// author: Robert Bui (astrogate@hotmail.com)
// source: http://javascript.internet.com/miscellaneous/random-image-rotator.html

var random_display = 1; // 0 = no, 1 = yes
var interval = 5; // delay in seconds
interval *= 1000;
var image_index = 0;

image_list = new Array();
image_list[image_index++] = new imageItem("/img/page/feature_1.jpg");
image_list[image_index++] = new imageItem("/img/page/feature_2.jpg");
image_list[image_index++] = new imageItem("/img/page/feature_3.jpg");
image_list[image_index++] = new imageItem("/img/page/feature_4.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);
}