function showWindow (id)
  {
   if (id == 2)
    {
     document.getElementById('switch_item_1st_parent').className = 'switch_item';
     document.getElementById('switchedbox_1st').style.display = 'none';     
     document.getElementById('switch_item_2nd_parent').className = 'switch_item active';
     document.getElementById('switchedbox_2nd').style.display = 'block';     
    }
   else
    {
     document.getElementById('switch_item_1st_parent').className = 'switch_item active';
     document.getElementById('switchedbox_1st').style.display = 'block';     
     document.getElementById('switch_item_2nd_parent').className = 'switch_item';
     document.getElementById('switchedbox_2nd').style.display = 'none';     
    } 
  }

 function changeImage(imgName, imgFile)
   {
    if( document.images )
      document.images[imgName].src = imgFile;
   }