if (document.images)        {            // Active Images
            img1on = new Image();
            img1on.src = "images/index_00001_01.jpg";
            img2on = new Image();
            img2on.src = "images/index_00001_03.jpg";
            img3on = new Image();
            img3on.src = "images/index_00001_05.jpg";
            img4on = new Image();
            img4on.src = "images/index_00001_07.jpg";
            img5on = new Image();
            img5on.src = "images/index_00001_09.jpg";
            img6on = new Image();
            img6on.src = "images/index_00001_11.jpg";
                        
            img1off = new Image();
            img1off.src = "images/index_0001_01.jpg";
            img2off = new Image();          
            img2off.src = "images/index_0001_03.jpg";
            img3off = new Image();          
            img3off.src = "images/index_0001_05.jpg";
            img4off = new Image();          
            img4off.src = "images/index_0001_07.jpg";
            img5off = new Image();          
            img5off.src = "images/index_0001_09.jpg";
            img6off = new Image();
            img6off.src = "images/index_0001_11.jpg";
       }

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");

        }
}