<!--
        if (document.images) {            // Active Images
            img1on = new Image();
            img1on.src = "obrazky/01_on.png";
            img2on = new Image();
            img2on.src = "obrazky/02_on.png";
            img3on = new Image();
            img3on.src = "obrazky/03_on.png";
            img4on = new Image();
            img4on.src = "obrazky/04_on.png";
            img5on = new Image();
            img5on.src = "obrazky/05_on.png";
            img6on = new Image();
            img6on.src = "obrazky/06_on.png";
            img7on = new Image();
            img7on.src = "obrazky/07_on.png";
            img8on = new Image();
            img8on.src = "obrazky/08_on.png";
            img9on = new Image();
            img9on.src = "obrazky/09_on.png";
            img10on = new Image();
            img10on.src = "obrazky/10_on.png";
            img1off = new Image();
            img1off.src = "obrazky/01_of.png";
            img2off = new Image();
            img2off.src = "obrazky/02_of.png";
            img3off = new Image();
            img3off.src = "obrazky/03_of.png";
            img4off = new Image();
            img4off.src = "obrazky/04_of.png";
            img5off = new Image();
            img5off.src = "obrazky/05_of.png";
            img6off = new Image();
            img6off.src = "obrazky/06_of.png"; 
            img7off = new Image();
            img7off.src = "obrazky/07_of.png"; 
            img8off = new Image();
            img8off.src = "obrazky/08_of.png"; 
            img9off = new Image();
            img9off.src = "obrazky/09_of.png"; 
            img10off = new Image();
            img10off.src = "obrazky/10_of.png"; 
        }
// 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");
        }
}
// -->