function Show(n){
document.getElementById(n).style.display = 'block';
}
function Hide(n){
document.getElementById(n).style.display = 'none';
}

function Change(n)
{
if (document.getElementById(n).style.display == 'none')
  document.getElementById(n).style.display = 'block';
  else document.getElementById(n).style.display = 'none';
}
//fce pro zmenu aktivity zalozky a obsahu v danem submenu
function zalozkaObsah(newId,submenu,obsah){
var f_el = document.getElementById(submenu).getElementsByTagName('div');
var flength = f_el.length;
for(i=0;i<flength;i++){
if (f_el[i].className == 'button active') f_el[i].className='button';
}
  document.getElementById(newId).className='button active';

var f_el = document.getElementById(obsah).getElementsByTagName('div');
var flength = f_el.length;
//aktivni kategorie
var active = document.getElementById(newId+"Obsah").getElementsByTagName('div');
var alength = active.length;

for(i=0;i<flength;i++){
  act = true;
  for(j=0;j<alength;j++){
    if(active[j] == f_el[i]) act = false;
  }
  if (act && f_el[i].className == 'zalozkaVisible') f_el[i].className='zalozkaHiden';
}
  document.getElementById(newId+"Obsah").className='zalozkaVisible';
}