if (document.images) {            // Active Images
            img1on = new Image();
            img1on.src = "/images/index_09.jpg";
            img2on = new Image();
            img2on.src = "/images/index_04.jpg";
            img3on = new Image();
            img3on.src = "/images/index_11.jpg";
            img4on = new Image();
            img4on.src = "/images/index_24.jpg";
            img5on = new Image();
            img5on.src = "/images/index_20.jpg";
           


            img1off = new Image();
            img1off.src = "images/indexoff_09.jpg";
            img2off = new Image();
            img2off.src = "images/indexoff_04.jpg";
            img3off = new Image();
            img3off.src = "images/indexoff_11.jpg";
            img4off = new Image();
            img4off.src = "images/indexoff_24.jpg";
            img5off = new Image();
            img5off.src = "images/indexoff_20.jpg";
        }
// 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");
        }
}