function enlargeImage($ImgName)
{
 if (document.images)
  {
  aImage = document.images[$ImgName].src;
  myWindow = window.open(aImage,"theWindow","width=500, height=500, left=100, top=150, toolbar=no, status=no, menubar=no, scrollbars=no, resizable=no");
  myWindow.focus();
  }
}

function ChangeImage ($ImgName, $ImgFile, $ImgDesc)
{
 if (document.images)
  {
  document.images[$ImgName].src = $ImgFile;
  document.images[$ImgName].title = $ImgDesc;
  }
}