function PP(id_elem)
      {
        var akapit = document.getElementById(id_elem);
        var akapit1 = document.getElementById('a1');
        var akapit2 = document.getElementById('a2');
        var akapit3 = document.getElementById('a3');        
        var akapit4 = document.getElementById('a4');
        var akapit5 = document.getElementById('a5');
        var akapit6 = document.getElementById('a6');        
        var akapit7 = document.getElementById('a7');
        var akapit8 = document.getElementById('a8');
        var akapit9 = document.getElementById('a9');        
        var akapit10 = document.getElementById('a10');
        var akapit11 = document.getElementById('a11');
        var akapit12 = document.getElementById('a12');        
        var akapit13 = document.getElementById('a13');
        var akapit14 = document.getElementById('a14');        
         
        akapit1.style.display = "none";
        akapit2.style.display = "none";
        akapit3.style.display = "none";
        akapit4.style.display = "none";
        akapit5.style.display = "none";
        akapit6.style.display = "none";
        akapit7.style.display = "none";
        akapit8.style.display = "none";
        akapit9.style.display = "none";
        akapit10.style.display = "none";
        akapit11.style.display = "none";
        akapit12.style.display = "none";
        akapit13.style.display = "none";
        akapit14.style.display = "none";
        
        akapit.style.display = "block";
      }

      function SP(id_elem)
      {
        var akapit = document.getElementById(id_elem);

        akapit.style.display = "none";
      }