if (document.images) {
            //home
            homeoff = new Image();
            homeoff.src = "images/nav/home1.gif";

            homeon = new Image();
            homeon.src = "images/nav/home2.gif";

            //services
            servicesoff = new Image();
            servicesoff.src = "images/nav/services1.gif";

            serviceson = new Image();
            serviceson.src = "images/nav/services2.gif";

            //login
            loginoff = new Image();
            loginoff.src = "images/nav/reports1.gif";

            loginon = new Image();
            loginon.src = "images/nav/reports2.gif";

            //contact
            contactoff = new Image();
            contactoff.src = "images/nav/contact1.gif";

            contacton = new Image();
            contacton.src = "images/nav/contact2.gif";

            //about
            aboutoff = new Image();
            aboutoff.src = "images/nav/about1.gif";

            abouton = new Image();
            abouton.src = "images/nav/about2.gif";

            //links
            linksoff = new Image();
            linksoff.src = "images/nav/links1.gif";

            linkson = new Image();
            linkson.src = "images/nav/links2.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");
        }
}