<!--
function changeImage(img) {
 
 var imageName;
 for (i = 1; i <= 5; i++) {
  imageName = "image" + i; 
  if (document.getElementById(imageName)) {
   document.getElementById(imageName).style.display='none';
  }
 }
 
 document.getElementById(img).style.display='block';
 
}
-->