if (document.images) {
var menu1on = new Image(); menu1on.src = "/images/button1a.gif";
var menu1off = new Image(); menu1off.src = "/images/button1.gif";
var menu2on = new Image(); menu2on.src = "/images/button2a.gif";
var menu2off = new Image(); menu2off.src = "/images/button2.gif";
var menu3on = new Image(); menu3on.src = "/images/button3a.gif";
var menu3off = new Image(); menu3off.src = "/images/button3.gif";
var menu4on = new Image(); menu4on.src = "/images/button4a.gif";
var menu4off = new Image(); menu4off.src = "/images/button4.gif";

var homeon = new Image(); homeon.src = "/images/homeicon1.gif";
var homeoff = new Image(); homeoff.src = "/images/homeicon.gif";
var letteron = new Image(); letteron.src = "/images/lettericon1.gif";
var letteroff = new Image(); letteroff.src = "/images/lettericon.gif";
var emailon = new Image(); emailon.src = "/images/emailicon1.gif";
var emailoff = new Image(); emailoff.src = "/images/emailicon.gif";
}

function button1on() {
if (document.images) {
    document.images.button1.src = menu1on.src;}
}
function button1off() {
if (document.images) {
    document.images.button1.src = menu1off.src;}
}
function button2on() {
if (document.images) {
    document.images.button2.src = menu2on.src;}
}
function button2off() {
if (document.images) {
    document.images.button2.src = menu2off.src;}
}
function button3on() {
if (document.images) {
    document.images.button3.src = menu3on.src;}
}
function button3off() {
if (document.images) {
    document.images.button3.src = menu3off.src;}
}
function button4on() {
if (document.images) {
    document.images.button4.src = menu4on.src;}
}
function button4off() {
if (document.images) {
    document.images.button4.src = menu4off.src;}
}

function icon1on() {
if (document.images) {
    document.images.icon1.src = homeon.src;}
}
function icon1off() {
if (document.images) {
    document.images.icon1.src = homeoff.src;}
}
function icon2on() {
if (document.images) {
    document.images.icon2.src = letteron.src;}
}
function icon2off() {
if (document.images) {
    document.images.icon2.src = letteroff.src;}
}
function icon3on() {
if (document.images) {
    document.images.icon3.src = emailon.src;}
}
function icon3off() {
if (document.images) {
    document.images.icon3.src = emailoff.src;}
}