function showsubmenu(submenu_id) {
		if (document.getElementById) {
		  if (active) {
		    document.getElementById("submenu" + active).className = 'closed';
		  }
		  if (active == submenu_id) {
		    active = false;
		  } else {
  		  active = submenu_id;
    		document.getElementById("submenu" + active).className = 'open';
  } } }

	function okno(img) {
		window.open(img,"okno","width=300,height=300,resizable=1");
	}

  function checkanketa() {
    var odpovedi = document.forms[0].odpoved_id;
    for (i=0;i<odpovedi.length;i++) {
      if (odpovedi[i].checked == true) return (true);
    }
    return (false);
  }