// define preloaded images for menu.
if (document.images) {
  var about_on = new Image(73,53);
  about_on.src = "/images/m_about_on.jpg";
  var about_off = new Image(73,53);
  about_off.src = "/images/m_about_off.jpg";

  var news_on = new Image(87,53);
  news_on.src = "/images/m_news_on.jpg";
  var news_off = new Image(87,53);
  news_off.src = "/images/m_news_off.jpg";

  var education_on = new Image(109,53);
  education_on.src = "/images/m_education_on.jpg";
  var education_off = new Image(109,53);
  education_off.src = "/images/m_education_off.jpg";

  var instruments_on = new Image(166,53);
  instruments_on.src = "/images/m_instruments_on.jpg";
  var instruments_off = new Image(166,53);
  instruments_off.src = "/images/m_instruments_off.jpg";

  var sheetmusic_on = new Image(81,53);
  sheetmusic_on.src = "/images/m_sheetmusic_on.jpg";
  var sheetmusic_off = new Image(81,53);
  sheetmusic_off.src = "/images/m_sheetmusic_off.jpg";

  var jobs_on = new Image(39,53);
  jobs_on.src = "/images/m_jobs_on.jpg";
  var jobs_off = new Image(39,53);
  jobs_off.src = "/images/m_jobs_off.jpg";

  var testimonials_on = new Image(86,53);
  testimonials_on.src = "/images/m_testimonials_on.jpg";
  var testimonials_off = new Image(86,53);
  testimonials_off.src = "/images/m_testimonials_off.jpg";

  var contact_on = new Image(70,53);
  contact_on.src = "/images/m_contact_on.jpg";
  var contact_off = new Image(70,53);
  contact_off.src = "/images/m_contact_off.jpg";
}

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

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