if (document.images) {
whoon = new Image(); // Active images
whoon.src = "images/who.on.gif";

whooff = new Image(); // Inactive images
whooff.src = "images/who.off.gif";

newson = new Image(); // Active images
newson.src = "images/news.on.gif";

newsoff = new Image(); // Inactive images
newsoff.src = "images/news.off.gif";

prodon = new Image(); // Active images
prodon.src = "images/prod.on.gif";

prodoff = new Image(); // Inactive images
prodoff.src = "images/prod.off.gif";

invon = new Image(); // Active images
invon.src = "images/inv.on.gif";

invoff = new Image(); // Inactive images
invoff.src = "images/inv.off.gif";

conon = new Image(); // Active images
conon.src = "images/conon.gif";

conoff = new Image(); // Inactive images
conoff.src = "images/conoff.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");
}
}