var interval = 5; // Timer (em segundos)
    var random_display = 0; // Randômico 0 = não, 1 = sim
    interval *= 1000;

    var image_index = 0;
    image_list = new Array();
    image_list[image_index++] = new imageItem("images/flash0.jpg");
    image_list[image_index++] = new imageItem("images/flash1.jpg");
    image_list[image_index++] = new imageItem("images/flash4.jpg");
    var image_index = -1;

    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);
    }