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

  var active_menu = false, tout = false;

  function showmenu(menu_id) {
		if (document.getElementById) {
		  if (tout) window.clearTimeout(tout);
		  if (active_menu == menu_id) return;
	    if (active_menu) hide_menu(active_menu);
	    active_menu = menu_id;
		  submenu = document.getElementById("subMenu" + menu_id);
		  if (submenu && (submenu.style.display == 'none' || !Boolean(submenu.style.display))) {
		    submenu.style.display = 'block';
		  }
		  topmenu = document.getElementById("menu" + menu_id);
      topmenu.className = topmenu.className.replace(/(\s)?topMenuLinkOut/g,"") + RegExp.$1 + "topMenuLinkOver";
      //
		}
  }

  function hidemenu(menu_id) {
    tout = window.setTimeout('hide_menu(\'' + menu_id + '\')',1000);
  }

  function hide_menu(menu_id) {
    submenu = document.getElementById("subMenu" + menu_id);
    if (submenu) submenu.style.display = 'none';
    topmenu = document.getElementById("menu" + menu_id);
		if (topmenu) topmenu.className = topmenu.className.replace(/(\s)?topMenuLinkOver/g,""); // + RegExp.$1 + "topMenuLinkOut";
    active_menu = false;
  }

  function checkSendForm(sendForm) {
    var i;
    var required = sendForm.elements["_required"].value.split(",");
    for (i in required) {
      if (sendForm.elements[required[i]] && sendForm.elements[required[i]].value == "") return alert("Musíte vyplnit pole " + required[i]);
    }
    return sendForm.submit();
  }

  function countChart(chart_id) {
    var i, counter = 0, disabled = false, item_disabled = false;
    var chart_form = document.getElementById(chart_id);
    var vote_limit = chart_form.votelimit.value;
    if (vote_limit > 0) {
      for (i=0;i<chart_form.elements.length;i++) {
        if (chart_form.elements[i].type == "checkbox" && chart_form.elements[i].checked == true) counter++;
      }
      disabled = (vote_limit <= counter);
      for (i=0;i<chart_form.elements.length;i++) {
        if (chart_form.elements[i].type == "checkbox") {
          item_disabled = !chart_form.elements[i].checked && disabled;
          chart_form.elements[i].disabled = item_disabled;
          document.getElementById('label_' + chart_form.elements[i].value).className = "label" + item_disabled;
        }
      }
    }
  }