var preloadFlag = false;

function preloadNavImages() {
    if (document.images) {
        main_nav01_over = newImage("_pix/_nav/main_nav01-over.gif");
        main_nav02_over = newImage("_pix/_nav/main_nav02-over.gif");
        main_nav03_over = newImage("_pix/_nav/main_nav03-over.gif");
        main_nav04_over = newImage("_pix/_nav/main_nav04-over.gif");
        main_nav05_over = newImage("_pix/_nav/main_nav05-over.gif");
        main_nav06_over = newImage("_pix/_nav/main_nav06-over.gif");

        bottom_nav_home_over = newImage("_pix/bottom_nav_home-over.gif");
        bottom_nav_search_over = newImage("images/bottom_nav_search-over.gif");
        bottom_nav_contact_over = newImage("images/bottom_nav_contact-over.gif");

preloadFlag = true;

    }
}