if (document.images) {
image1on = new Image();
image1on.src = "pic/non1.jpg";
image1off = new Image();
image1off.src = "pic/noff1.jpg";

}

if (document.images) {
image2on = new Image();
image2on.src = "pic/non2.jpg";
image2off = new Image();
image2off.src = "pic/noff2.jpg";

}

if (document.images) {
image3on = new Image();
image3on.src = "pic/non3.jpg";
image3off = new Image();
image3off.src = "pic/noff3.jpg";

}

if (document.images) {
image4on = new Image();
image4on.src = "pic/non4.jpg";
image4off = new Image();
image4off.src = "pic/noff4.jpg";

}

if (document.images) {
image5on = new Image();
image5on.src = "pic/non5.jpg";
image5off = new Image();
image5off.src = "pic/noff5.jpg";

}

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");
}
}