if (document.images) {
    var boardNum = 0;
    var boardSpeed = 10000;

    // Create an array of images for the billboard 
    var billboard = new Array();
    billboard[0] = new Image();
    billboard[0].src = "promo/promo_01.gif";
    billboard[1] = new Image();
    billboard[1].src = "promo/promo_02.gif";
    billboard[2] = new Image();
    billboard[2].src = "promo/promo_03.gif";

    // Create an array of URLs that correspond to the images
    var url = new Array();
    url[0] = "#";
    url[1] = "#";
    url[2] = "#";
}

// Function to rotate the images on the billboard
function rotateBoard() {
    if (boardNum < (billboard.length - 1)) {
         boardNum++;
    }
    else {
        boardNum = 0;
    }
    document.billboard.src = billboard[boardNum].src;
    setTimeout('rotateBoard()', boardSpeed);
}

// Function to load the appropriate URL when the user clicks on an image
function jumpBillboard() {
    window.location = url[boardNum];
}