if (document.images) {            // Active Images

            biografieon = new Image();
            biografieon.src = "/_img/nav_04_2.gif";
            ensembleson = new Image();
            ensembleson.src = "/_img/nav_02_2.gif";
            hoerprobenon = new Image();
            hoerprobenon.src = "/_img/nav_05_2.gif";
            impressumon = new Image();
            impressumon.src = "/_img/nav_08_2.gif";
            konzerteon = new Image();
            konzerteon.src = "/_img/nav_01_2.gif";
            linkson = new Image();
            linkson.src = "/_img/nav_06_2.gif";
            newsletteron = new Image();
            newsletteron.src = "/_img/nav_07_2.gif";
            unterrichton = new Image();
            unterrichton.src = "/_img/nav_03_2.gif";

            biografieoff = new Image();
            biografieoff.src = "/_img/nav_04_1.gif";
            ensemblesoff = new Image();
            ensemblesoff.src = "/_img/nav_02_1.gif";
            hoerprobenoff = new Image();
            hoerprobenoff.src = "/_img/nav_05_1.gif";
            impressumoff = new Image();
            impressumoff.src = "/_img/nav_08_1.gif";
            konzerteoff = new Image();
            konzerteoff.src = "/_img/nav_01_1.gif";
            linksoff = new Image();
            linksoff.src = "/_img/nav_06_1.gif";
            newsletteroff = new Image();
            newsletteroff.src = "/_img/nav_07_1.gif";
            unterrichtoff = new Image();
            unterrichtoff.src = "/_img/nav_03_1.gif";

        }

// Function to 'activate' images.
function imgon(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "on.src");
        }
}

// Function to 'deactivate' images.
function imgoff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");
        }
}