if (document.images) {
  var homeoff = new Image(); // for the inactive image
  homeoff.src = "images/home_button_off.gif";
  var homeon = new Image(); // for the active image
  homeon.src = "images/home_button_on.gif";
  var emailoff = new Image(); // for the inactive image
  emailoff.src = "images/email_button_off.gif";
  var emailon = new Image(); // for the active image
  emailon.src = "images/email_button_on.gif";
  var auditionoff = new Image(); // for the inactive image
  auditionoff.src = "images/audition_button_off.gif";
  var auditionon = new Image(); // for the active image
  auditionon.src = "images/audition_button_on.gif";
  var reservationoff = new Image(); // for the inactive image
  reservationoff.src = "images/reservation_button_off.gif";
  var reservationon = new Image(); // for the active image
  reservationon.src = "images/reservation_button_on.gif";
  var chtheoff = new Image(); // for the inactive image
  chtheoff.src = "images/chthe_button_off.gif";
  var chtheon = new Image(); // for the active image
  chtheon.src = "images/chthe_button_on.gif";
  var upcomingoff = new Image(); // for the inactive image
  upcomingoff.src = "images/upcoming_button_off.gif";
  var upcomingon = new Image(); // for the active image
  upcomingon.src = "images/upcoming_button_on.gif";
  var historyoff = new Image(); // for the inactive image
  historyoff.src = "images/history_button_off.gif";
  var historyon = new Image(); // for the active image
  historyon.src = "images/history_button_on.gif";
  var volunteeroff = new Image(); // for the inactive image
  volunteeroff.src = "images/volunteer_button_off.gif";
  var volunteeron = new Image(); // for the active image
  volunteeron.src = "images/volunteer_button_on.gif";
  var wantoff = new Image(); // for the inactive image
  wantoff.src = "images/want_list_off.gif";
  var wanton = new Image(); // for the active image
  wanton.src = "images/want_list_on.gif";
  var newsletteroff = new Image(); // for the inactive image
  newsletteroff.src = "images/newsletter_button_off.gif";
  var newsletteron = new Image(); // for the active image
  newsletteron.src = "images/newsletter_button_on.gif";
  var schedulesoff = new Image(); // for the inactive image
  schedulesoff.src = "images/newsletter_button_off.gif";
  var scheduleson = new Image(); // for the active image
  scheduleson.src = "images/newsletter_button_on.gif";
  var fundraisingoff = new Image(); // for the inactive image
  fundraisingoff.src = "images/newsletter_button_off.gif";
  var fundraisingon = new Image(); // for the active image
  fundraisingon.src = "images/newsletter_button_on.gif";
}

function act() {
  if (document.images)
    document.images.advan.src = emailon.src;
}

function inact() {
  if (document.images)
    document.images.advan.src = emailoff.src;
}
function audition_on() {
  if (document.images)
    document.images.audition.src = auditionon.src;
}

function audition_off() {
  if (document.images)
    document.images.audition.src = auditionoff.src;
}
function reservation_on() {
  if (document.images)
    document.images.reservation.src = reservationon.src;
}

function reservation_off() {
  if (document.images)
    document.images.reservation.src = reservationoff.src;
}
function chthe_on() {
  if (document.images)
    document.images.chthe.src = chtheon.src;
}

function chthe_off() {
  if (document.images)
    document.images.chthe.src = chtheoff.src;
}
function upcoming_on() {
  if (document.images)
    document.images.upcoming.src = upcomingon.src;
}

function upcoming_off() {
  if (document.images)
    document.images.upcoming.src = upcomingoff.src;
}
function history_on() {
  if (document.images)
    document.images.history.src = historyon.src;
}

function history_off() {
  if (document.images)
    document.images.history.src = historyoff.src;
}
function home_on() {
  if (document.images)
    document.images.home.src = homeon.src;
}

function home_off() {
  if (document.images)
    document.images.home.src = homeoff.src;
}
function volunteer_on() {
  if (document.images)
    document.images.volunteer.src = volunteeron.src;
}

function volunteer_off() {
  if (document.images)
    document.images.volunteer.src = volunteeroff.src;
}
function want_list_on() {
  if (document.images)
    document.images.want.src = wanton.src;
}

function want_list_ off() {
  if (document.images)
    document.images.want.src = wantoff.src;
}
function schedules_on() {
  if (document.images)
    document.images.want.src = wanton.src;
}

function schedules_ off() {
  if (document.images)
    document.images.want.src = wantoff.src;
}
function fundraising_on() {
  if (document.images)
    document.images.want.src = wanton.src;
}

function fundraising_off() {
  if (document.images)
    document.images.want.src = wantoff.src;
}