if(document.images) {
    ducks = new Array();
    ducks[23] = new Image();
    ducks[23].src = "/elearning/images/navigation/compfund_white_button.jpg";
    ducks[24] = new Image();
    ducks[24].src = "/elearning/images/navigation/compfund_white_rolo.jpg";
    ducks[25] = new Image();
    ducks[25].src = "/elearning/images/navigation/office_white_button.jpg";
    ducks[26] = new Image();
    ducks[26].src = "/elearning/images/navigation/office_white_rolo.jpg";
    ducks[27] = new Image();
    ducks[27].src = "/elearning/images/navigation/personal_white_button.jpg";
    ducks[28] = new Image();
    ducks[28].src = "/elearning/images/navigation/personal_white_rolo.jpg";
    ducks[29] = new Image();
    ducks[29].src = "/elearning/images/navigation/it_white_button.jpg";
    ducks[30] = new Image();
    ducks[30].src = "/elearning/images/navigation/it_white_rolo.jpg";
    ducks[31] = new Image();
    ducks[31].src = "/elearning/images/navigation/database_white_button.jpg";
    ducks[32] = new Image();
    ducks[32].src = "/elearning/images/navigation/database_white_rolo.jpg";
    ducks[33] = new Image();
    ducks[33].src = "/elearning/images/navigation/web_white_button.jpg";
    ducks[34] = new Image();
    ducks[34].src = "/elearning/images/navigation/web_white_rolo.jpg";
    ducks[35] = new Image();
    ducks[35].src = "/elearning/images/navigation/vocational_white_button.jpg";
    ducks[36] = new Image();
    ducks[36].src = "/elearning/images/navigation/vocational_white_rolo.jpg";
        }   
    function mover(from,to) {
    if(document.images) {
    document.images[from].src = ducks[to].src;
    }
  }