var preloadFlag = false;

function newImage(arg) {
    if (document.images) {
        rslt = new Image();
        rslt.src = arg;
        return rslt;
    }
}

function changeImages(name, image) {
    if (document.images && (preloadFlag == true)) {
        document[name].src = image;
    }
}

function preloadImages() {
    if (document.images) {
        blacktop_02_over = newImage("images/blacktop_02-over.gif");
        blacktop_03_over = newImage("images/blacktop_03-over.gif");
        blacktop_04_over = newImage("images/blacktop_04-over.gif");
        blue_06_over = newImage("images/blue_06-over.gif");
        blue_07_over = newImage("images/blue_07-over.gif");
        blue_08_over = newImage("images/blue_08-over.gif");
        redtabs_01_over = newImage("images/redtabs_01-over.gif");
        redtabs_03_over = newImage("images/redtabs_03-over.gif");
        redtabs_04_over = newImage("images/redtabs_04-over.gif");
        redtabs_05_over = newImage("images/redtabs_05-over.gif");
        menu_03_over = newImage("images/menu_03_over.gif");
        menu_05_over = newImage("images/menu_05_over.gif");
        menu_07_over = newImage("images/menu_07_over.gif");
        menu_09_over = newImage("images/menu_09_over.gif");
        menu_11_over = newImage("images/menu_11_over.gif");
        partners_05_over = newImage("images/partners_05-over.gif");
        partners_11_over = newImage("images/partners_11-over.gif");
        partners_17_over = newImage("images/partners_17-over.gif");

        preloadFlag = true;
    }
}

function setHeaderImage() {
    var imgs = new Array (
        "banner_boston.gif",
        "banner_usatoday.gif",
        "banner_nypost.gif"
    );
    var imageNumber=Math.floor((Math.random() * imgs.length)%imgs.length);
    var image = "images/" + imgs[imageNumber];

    document.images.banner.src = image;
    window.setTimeout("setHeaderImage()", 10000);
}