function show_hos(){
        el=document.getElementById('brushos').style;
        el.display= 'block';
        el=document.getElementById('vstup').style;
        el.display= 'block';
        el=document.getElementById('brussenk1').style;
        el.display= 'block';
      }

      function hide_hos(){
        el=document.getElementById('brushos').style;
        el.display= 'none';
        el=document.getElementById('vstup').style;
        el.display= 'none';
        el=document.getElementById('brussenk1').style;
        el.display= 'none';
      }

      function show_senk(){
        el=document.getElementById('brussenk').style;
        el.display= 'block';
        el=document.getElementById('vstup').style;
        el.display= 'block';
        el=document.getElementById('brushos1').style;
        el.display= 'block';
      }

      function hide_senk(){
        el=document.getElementById('brussenk').style;
        el.display= 'none';
        el=document.getElementById('vstup').style;
        el.display= 'none';
        el=document.getElementById('brushos1').style;
        el.display= 'none';
      }

      function naplnCas (){
        var datum = new Date();
        var denVTydnu = new Array("neděle","pondělí", "úterý", "středa", "čtvrtek", "pátek", "sobota");
        if (datum.getMinutes() < 10)
          minuty = "0" + datum.getMinutes();
          else minuty = datum.getMinutes();
        mesic = datum.getMonth() + 1;
        aktualniCas = denVTydnu[datum.getDay()] + ", " + datum.getDate() + "." + mesic + "." + datum.getFullYear() + " " + datum.getHours() + ":" + minuty;
        window.document.getElementById("cas").innerHTML = aktualniCas;}