// JavaScript Document
    function DivReportClick(id){
// "vypujceno" od Jury. S jeho svolením!
      var div;
      div = document.getElementById(id);
      if( div.style.display == 'none'){
        div.style.display='block';
      } else {
        div.style.display='none';
      }
      return true;
    }
/******************************************************/
  function spocitejDelku(){
/******************************************************/

 with (document){
 //alert('vypocet delky lekce');
 getElementById('delka').value = (getElementById('jednotka-delka').value * getElementById('jednotka-pocet').value);
//  getElementsByTagName('prestavka')[0].focus();
 getElementById("prestavka").focus();
 getElementById("prestavka").select();
}
}