function switchImage(from,to,identifier)
{
  normalizeImages();
  from = document.getElementById(identifier + from);
  to = document.getElementById(identifier + to);

  tmp = to.src;
  to.src = from.src;
  from.src = tmp;

  document.getElementById(identifier + to).width="320";
  document.getElementById(identifier + to).height="220";
  from.width="75";
  from.height="50";
}

function normalizeImages()
{
  document.getElementById('img2').width = "75";
  document.getElementById('img2').height = "50";

  document.getElementById('img3').width = "75";
  document.getElementById('img3').height = "50";

  document.getElementById('img4').width = "75";
  document.getElementById('img4').height = "50";

  document.getElementById('img5').width = "75";
  document.getElementById('img5').height = "50";

  document.getElementById('img6').width = "75";
  document.getElementById('img6').height = "50";
}

function showBigImage(from,to,identifier)
{
  from = document.getElementById(identifier + from);
  to = document.getElementById(identifier + to);

  to.src = from.src;
 
  document.getElementById(identifier + to).width="320";
  document.getElementById(identifier + to).height="220";
//  from.width="75";
//  from.height="50";
}