if (document.images) {
  image1on = new Image();
  image1on.src ="/.include/button/j/top_home_on.png";
  image2on = new Image();
  image2on.src ="/.include/button/j/top_ae2_on.png";
  image3on = new Image();
  image3on.src ="/.include/button/j/top_asca_on.png";
  image4on = new Image();
  image4on.src ="/.include/button/j/top_ginga_on.png";
  image5on = new Image();
  image5on.src ="/.include/button/j/top_sitemap_on.png";
  image6on = new Image();
  image6on.src ="/.include/button/j/top_english_on.png";

  image7on = new Image();
  image7on.src ="/.include/button/j/top_on.png";
  image8on = new Image();
  image8on.src ="/.include/button/j/aetop_on.png";
  image9on = new Image();
  image9on.src ="/.include/button/j/news_on.png";
  image10on = new Image();
  image10on.src ="/.include/button/j/objective_on.png";
  image11on = new Image();
  image11on.src ="/.include/button/j/instrument_on.png";
  image12on = new Image();
  image12on.src ="/.include/button/j/teamintro_on.png";
  image13on = new Image();
  image13on.src ="/.include/button/j/bib_on.png";
  image14on = new Image();
  image14on.src ="/.include/button/j/swgonly_on.png";
  image15on = new Image();
  image15on.src ="/.include/button/j/teamonly_on.png";

  image1off = new Image();
  image1off.src ="/.include/button/j/top_home_off.png";
  image2off = new Image();
  image2off.src ="/.include/button/j/top_ae2_off.png";
  image3off = new Image();
  image3off.src ="/.include/button/j/top_asca_off.png";
  image4off = new Image();
  image4off.src ="/.include/button/j/top_ginga_off.png";
  image5off = new Image();
  image5off.src ="/.include/button/j/top_sitemap_off.png";
  image6off = new Image();
  image6off.src ="/.include/button/j/top_english_off.png";

  image7off = new Image();
  image7off.src ="/.include/button/j/top_off.png";
  image8off = new Image();
  image8off.src ="/.include/button/j/aetop_off.png";
  image9off = new Image();
  image9off.src ="/.include/button/j/news_off.png";
  image10off = new Image();
  image10off.src ="/.include/button/j/objective_off.png";
  image11off = new Image();
  image11off.src ="/.include/button/j/instrument_off.png";
  image12off = new Image();
  image12off.src ="/.include/button/j/teamintro_off.png";
  image13off = new Image();
  image13off.src ="/.include/button/j/bib_off.png";
  image14off = new Image();
  image14off.src ="/.include/button/j/swgonly_off.png";
  image15off = new Image();
  image15off.src ="/.include/button/j/teamonly_off.png";
}

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

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