function setClass_2(cls) { 
document.getElementById("hide_2").style.display=cls;
}

function rozliseni_obrazovky()
    {
      var vyska_roz;

      vyska_roz = screen.height;

      if(vyska_roz <= 800)
        {
          document.getElementById("hide_2").style.display="none";
        }
      else
        {
          document.getElementById("hide_2").style.display="block";
        }
    }