compat = false;
if( parseInt( navigator.appVersion ) >= 3 ) { compat = true; }
if( compat ){

// Active images
img1on = new Image();
img1on.src = "nav/nav1a.jpg";
img2on = new Image();
img2on.src = "nav/nav2a.jpg";
img3on = new Image();
img3on.src = "nav/nav3a.jpg";
img4on = new Image();
img4on.src = "nav/nav4a.jpg";
img5on = new Image();
img5on.src = "nav/nav5a.jpg";
img6on = new Image();
img6on.src = "nav/nav6a.jpg";

// Inactive images
img1off = new Image();
img1off.src = "nav/nav1.jpg";
img2off = new Image();
img2off.src = "nav/nav2.jpg";
img3off = new Image();
img3off.src = "nav/nav3.jpg";
img4off = new Image();
img4off.src = "nav/nav4.jpg";
img5off = new Image();
img5off.src = "nav/nav5.jpg";
img6off = new Image();
img6off.src = "nav/nav6.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");
        }
}