if (document.images) {

image1off = new Image();
image1off.src = "images/e_main_menu_item_01a_off.gif";
image2off = new Image();
image2off.src = "images/e_main_menu_item_01b_off.gif";
image3off = new Image();
image3off.src = "images/e_main_menu_item_01c_off.gif";
image4off = new Image();
image4off.src = "images/e_main_menu_item_02_off.gif";
image5off = new Image();
image5off.src = "images/e_main_menu_item_03_off.gif";
menu_us1off = new Image();
menu_us1off.src = "images/menu_us_01_off.gif";
menu_us2off = new Image();
menu_us2off.src = "images/menu_us_02_off.gif";
menu_us3off = new Image();
menu_us3off.src = "images/menu_us_03_off.gif";
menu_us4off = new Image();
menu_us4off.src = "images/menu_us_04_off.gif";
menu_us5off = new Image();
menu_us5off.src = "images/menu_us_05_off.gif";
menu_us6off = new Image();
menu_us6off.src = "images/menu_us_06_off.gif";
menu_us7off = new Image();
menu_us7off.src = "images/menu_us_07_off.gif";
menu_us8off = new Image();
menu_us8off.src = "images/menu_us_08_off.gif";

image1on = new Image();
image1on.src = "images/e_main_menu_item_01a_on.gif";
image2on = new Image();
image2on.src = "images/e_main_menu_item_01b_on.gif";
image3on = new Image();
image3on.src = "images/e_main_menu_item_01c_on.gif";
image4on = new Image();
image4on.src = "images/e_main_menu_item_02_on.gif";
image5on = new Image();
image5on.src = "images/e_main_menu_item_03_on.gif";
menu_us1on = new Image();
menu_us1on.src = "images/menu_us_01_on.gif";
menu_us2on = new Image();
menu_us2on.src = "images/menu_us_02_on.gif";
menu_us3on = new Image();
menu_us3on.src = "images/menu_us_03_on.gif";
menu_us4on = new Image();
menu_us4on.src = "images/menu_us_04_on.gif";
menu_us5on = new Image();
menu_us5on.src = "images/menu_us_05_on.gif";
menu_us6on = new Image();
menu_us6on.src = "images/menu_us_06_on.gif";
menu_us7on = new Image();
menu_us7on.src = "images/menu_us_07_on.gif";
menu_us8on = new Image();
menu_us8on.src = "images/menu_us_08_on.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");
}}