if (document.images) {
    img1 = new Image();
    img1.src = "../images/nav_home_selected.jpg";
    img2 = new Image();
    img2.src = "../images/nav_watch_selected.jpg";
    img3 = new Image();
    img3.src = "../images/nav_about_selected.jpg";
    img4 = new Image();
    img4.src = "../images/nav_contact_selected.jpg";
    img5 = new Image();
    img5.src = "../images/btn_cep_on.jpg";
    img6 = new Image();
    img6.src = "../images/btn_info_on.jpg";
    img7 = new Image();
    img7.src = "../images/btn_benefits_on.jpg";    
}