browser = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion)
>= 3 )) || ((navigator.appName == "Microsoft Internet Explorer") &&
(parseInt(navigator.appVersion) > 3 )))
if ( browser)  {

homeson = new Image();
homeson.src = "images/shomeson.gif";

homesoff = new Image();
homesoff.src = "images/shomesoff.gif";

buyerson = new Image();
buyerson.src = "images/sbuyerson.gif";

buyersoff = new Image();
buyersoff.src = "images/sbuyersoff.gif";

sellerson = new Image();
sellerson.src = "images/ssellerson.gif";

sellersoff = new Image();
sellersoff.src = "images/ssellersoff.gif";

infoon = new Image();
infoon.src = "images/scommon.gif";

infooff = new Image();
infooff.src = "images/scommoff.gif";

schoolon = new Image();
schoolon.src = "images/sschoolon.gif";

schooloff = new Image();
schooloff.src = "images/sschooloff.gif";
}

function img_on(imgName) {

if ( browser) {
 imgoff = eval(imgName + "on.src");
document[imgName].src = imgoff;
 }
}

function img_off(imgName) {

  if ( browser) {
 imgon = eval(imgName + "off.src");
    document[imgName].src = imgon;
 }
}