var current_user = -1;
function look(id)
{
  var div;
  var div_p;

  // ha mar meg van nyitva vmi, bezarjuk
  if (current_user != -1)
  {
    div = document.getElementById(current_user);
    if (div)
    {
      div_p = div.parentNode.parentNode;
      div_p.className = div_p.className.replace(/displaytr/, "hiddentable");
      div.className = div.className.replace(/visibleblock/, "hiddentable");
    }
  }
  
  // ha nem a megnyitottra kattintottunk
  if (current_user != id)
  {
    div = document.getElementById(id);
    div_p = div.parentNode.parentNode;
    div_p.className = div_p.className.replace(/hiddentable/, "displaytr");
    div.className = div.className.replace(/hiddentable/, "visibleblock");
    current_user = id;
  }
  else
  {
    current_user = -1;
  }
}