function winOpen(stranka,sirka,vyska)
    {
        window.open(stranka,"","dependent,toolbar=no,scrollbars=yes,width="+sirka+",height="+vyska);
    }

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