if (document.images) {

  image_off = new Image(10,9);

  image_off.src="img/button1.png";



  image_on = new Image(10,9);

  image_on.src="img/button0.png";

}



function change(picName,imgName) {

   if (document.images) {

      imgOn=eval(imgName + ".src");

      document[picName].src= imgOn;

    }

 }