<!--
if (document.images) {
button1on = new Image();
button1on.src = "img/button1_on.gif";
button1off = new Image();
button1off.src = "img/button1_off.gif";

button2on = new Image();
button2on.src = "img/button2_on.gif";
button2off = new Image();
button2off.src = "img/button2_off.gif";

}

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");
}
}
-->