// okna

function window1(a) {
window.open (a, 'char', 'toolbar=no, menubar=no, location=no, directories=no, scrollbars=no, resizable=yes, status=yes, width=650, height=490, top=10, left=10');
}

function window2(a) {
window.open (a, 'char', 'toolbar=no, menubar=no, location=no, directories=no, scrollbars=no, resizable=yes, status=yes, width=473, height=650, top=10, left=10');
}

function window3(a) {
window.open (a, 'char', 'toolbar=yes, menubar=yes, location=yes, directories=yes, scrollbars=yes, resizable=yes, status=yes, width=1000, height=600, top=10, left=10');
}

function zmen_okno() {
w =document.images['img'].width+9;
h =document.images['img'].height+81;
window.resizeTo (w, h);
window.focus ();
}

function zmen_okno2() {
w =document.images['img'].width+69;
h =document.images['img'].height+106;

if (w > screen.availWidth - 20) w = screen.availWidth - 20;
if (h > screen.availHeight - 100) h = screen.availHeight - 100;

window.resizeTo (w, h);
window.focus();
}

// formulare

function clearvalue(a) {
  a.value='';
}

// skryt cast stranky

function zobrazSkryj(idecko){
  el=document.getElementById(idecko).style;
  el.display=(el.display == 'block')?'none':'block';
}

function skrytVse(){
  if (document.getElementById('prog-sekce')){
    document.getElementById('prog-sekce').style.display='none';
  }
}