function o_s_c(){var czas = new Date();var godz = czas.getHours();if(godz < 10){godz = '0' + godz;}var min = czas.getMinutes();if(min < 10){min = '0' + min;}var sec = czas.getSeconds();if(sec < 10){sec = '0' + sec;}document.getElementById('clock1').innerHTML=godz + ':' + min + ':' + sec;}setInterval('o_s_c();',500);  function toggleVisible(e){   var e = document.getElementById(e);   if (!e)   {  return false;   }   if (e.style.display != 'block')   {  e.style.display = 'block';   }   else   {  e.style.display = 'none';   }}