if (document.images) {            // Active Images
            img1on = new Image();      
            img1on.src = "images/about_us.jpg";

            img2on = new Image();      
            img2on.src = "images/our_soap.jpg";

            img3on = new Image();      
            img3on.src = "images/room_perf.jpg";

            img4on = new Image();      
            img4on.src = "images/how_to.jpg";

            img5on = new Image();      
            img5on.src = "images/ingredients.jpg";

            img6on = new Image();      
            img6on.src = "images/contact.jpg";

            img1off = new Image(); 
            img1off.src = "images/about_us_on.jpg";

            img2off = new Image(); 
            img2off.src = "images/our_soap_on.jpg";

            img3off = new Image(); 
            img3off.src = "images/room_perf_on.jpg";

            img4off = new Image(); 
            img4off.src = "images/how_to_on.jpg";

            img5off = new Image(); 
            img5off.src = "images/ingredients_on.jpg";

            img6off = new Image(); 
            img6off.src = "images/contact_on.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");
        }
}