function swapImage(image, altText) {
  document['largePhoto'].src = 'images/' + image;
  document['largePhoto'].alt = altText;
  showContent(altText);
  return;
}

function showContent(altText)  {
   var ie4=document.all&&navigator.userAgent.indexOf("Opera")==-1;
   var ns6=document.getElementById&&navigator.userAgent.indexOf("Opera")==-1;
   var ns4=document.layers;

   if(ie4) {
      showContentObj=document.all.PhotoView;
   }
   if(ns6) {
      showContentObj=document.getElementById("PhotoView");
   }
   if(ie4||ns6) {
      if(showContentObj.innerHTML!="<p>" + altText + "</p>") {
         showContentObj.innerHTML="<p>" + altText + "</p>";
      } else {
         //do nothing
      }
   }
}