if (document.images) {
        homeon = new Image();
        homeon.src = "images/nav_home_on.gif";
        homeoff = new Image();
        homeoff.src = "images/nav_home.gif";

        abouton = new Image();
        abouton.src = "images/nav_about_on.gif";
        aboutoff = new Image();
        aboutoff.src = "images/nav_about.gif";

        balleton = new Image();
        balleton.src = "images/nav_ballet_on.gif";
        balletoff = new Image();
        balletoff.src = "images/nav_ballet.gif";

        contacton = new Image();
        contacton.src = "images/nav_contact_on.gif";
        contactoff = new Image();
        contactoff.src = "images/nav_contact.gif";

        givingon = new Image();
        givingon.src = "images/nav_giving_on.gif";
        givingoff = new Image();
        givingoff.src = "images/nav_giving.gif";

        perfon = new Image();
        perfon.src = "images/nav_performances_on.gif";
        perfoff = new Image();
        perfoff.src = "images/nav_performances.gif";

        regon = new Image();
        regon.src = "images/nav_registration_on.gif";
        regoff = new Image();
        regoff.src = "images/nav_registration.gif";

        scheduleson = new Image();
        scheduleson.src = "images/nav_schedules_on.gif";
        schedulesoff = new Image();
        schedulesoff.src = "images/nav_schedules.gif";

        schoolon = new Image();
        schoolon.src = "images/nav_school_on.gif";
        schooloff = new Image();
        schooloff.src = "images/nav_school.gif";

        volunteeron = new Image();
        volunteeron.src = "images/nav_volunteer_on.gif";
        volunteeroff = new Image();
        volunteeroff.src = "images/nav_volunteer.gif";
}

function imgOn(imgName) {
        if (document.images) {
                document[imgName].src = eval(imgName + "on.src");
        }
}

function imgOff(imgName) {
        if (document.images) {
                document[imgName].src = eval(imgName + "off.src");
        }
}