if (navigator.appVersion.substring(0,1) >= 3){ 

  image1on = new Image();
  image1on.src = "images/tophomeon.jpg";

  image1off = new Image();
  image1off.src = "images/tophomeoff.jpg";

  image2on = new Image();
  image2on.src = "images/topabouton.jpg";

  image2off = new Image();
  image2off.src = "images/topaboutoff.jpg";

  image3on = new Image();
  image3on.src = "images/topproductson.jpg";

  image3off = new Image();
  image3off.src = "images/topproductsoff.jpg";

  image4on = new Image();
  image4on.src = "images/topspecon.jpg";

  image4off = new Image();
  image4off.src = "images/topspecoff.jpg";

  image5on = new Image();
  image5on.src = "images/topquoteon.jpg";

  image5off = new Image();
  image5off.src = "images/topquoteoff.jpg";

}

function changeImages() {
if (navigator.appVersion.substring(0,1) >= 3){ 
for (var i=0; i<changeImages.arguments.length; i+=2) {
document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}