function setview(element)
   {
    obj=document.getElementById(element);
    if (obj.style.display=="block")
     {
      obj.style.display="none";
     }
    else
     {
      obj.style.display="block";
     }
   }

  function setview_dupla(element1, element2)
   {
    obj1=document.getElementById(element1);
    obj2=document.getElementById(element2);
    if (obj1.style.display=="block")
     {
      obj1.style.display="none";
      obj2.style.display="block";
     }
 else
     {
      obj1.style.display="block";
      obj2.style.display="none";
     }
   }