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

function changeImages() {
    if (document.images && (preloadFlag == true)) {
        for (var i=0; i<changeImages.arguments.length; i+=2) {
            document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
        }
    }
}

var preloadFlag = false;
function preloadImages() {
    if (document.images) {
        nav_home_over = newImage("/files/nav_home-over.gif");
        nav_about_over = newImage("/files/nav_about-over.gif");
        nav_focus_over = newImage("/files/nav_focus-over.gif");
        nav_prevention_over = newImage("/files/nav_prevention-over.gif");
        nav_afterschool_over = newImage("/files/nav_afterschool-over.gif");
        nav_mentoring_over = newImage("/files/nav_mentoring-over.gif");
        nav_summercamp_over = newImage("/files/nav_summercamp-over.gif");
        nav_events_over = newImage("/files/nav_events-over.gif");
        nav_getinvolved_over = newImage("/files/nav_getinvolved-over.gif");
        nav_volunteer_over = newImage("/files/nav_volunteer-over.gif");
        nav_donate_over = newImage("/files/nav_donate-over.gif");
        nav_employment_over = newImage("/files/nav_employment-over.gif");
        nav_wishlist_over = newImage("/files/nav_wishlist-over.gif");
        nav_newsletter_over = newImage("/files/nav_newsletter-over.gif");
        nav_supporters_over = newImage("/files/nav_supporters-over.gif");
        nav_photos_over = newImage("/files/nav_photos-over.gif");
        nav_press_over = newImage("/files/nav_press-over.gif");
        nav_forms_over = newImage("/files/nav_forms-over.gif");
        nav2_contact_over = newImage("/files/nav2_contact-over.gif");
        nav2_links_over = newImage("/files/nav2_links-over.gif");
        nav2_sitemap_over = newImage("/files/nav2_sitemap-over.gif");
        preloadFlag = true;
    }
}