function DotazAN(otazka)
{
  if (confirm(otazka)) return true; else return false;
}


function top_menu_ch  (imgName,imgName2) 
{ 
  if (document.images) 
    document[imgName].src = eval(imgName2 + '.src') 
}

function user_menu_ch  (imgName,imgName2) 
{ 
  if (document.images) 
    document[imgName].src = eval(imgName2 + '.src') 
}


function BestLogo()
{
  document.TopImage.src="./images/TopImage.jpg";
  document.TopImage.style.width = document.body.clientWidth * 0.94;
  tab = document.getElementById("TopImageCell");
  document.TopImage.style.width = tab.scrollWidth-4;
}

DOM = (document.getElementById) ? 1 : 0;
NS4 = (document.layers) ? 1 : 0;
Konqueror = (navigator.userAgent.indexOf("Konqueror") > -1) ? 1 : 0;
Konqueror21 = (navigator.userAgent.indexOf("Konqueror 2.1") > -1 || navigator.userAgent.indexOf("Konqueror/2.1") > -1) ? 1 : 0;
Konqueror22 = (navigator.userAgent.indexOf("Konqueror 2.2") > -1 || navigator.userAgent.indexOf("Konqueror/2.2") > -1) ? 1 : 0;
Konqueror2 = Konqueror21 || Konqueror22;
Opera = (navigator.userAgent.indexOf("Opera") > -1) ? 1 : 0;
Opera5 = (navigator.userAgent.indexOf("Opera 5") > -1 || navigator.userAgent.indexOf("Opera/5") > -1) ? 1 : 0;
Opera6 = (navigator.userAgent.indexOf("Opera 6") > -1 || navigator.userAgent.indexOf("Opera/6") > -1) ? 1 : 0;
Opera56 = Opera5 || Opera6;
IE = (document.all) ? 1 : 0;
IE4 = IE && !DOM;

function getWindowHeight() {
      var value = 0;
      if ((DOM && !IE) || NS4 || Konqueror || Opera) {
            value = top.innerHeight;
//      } else if (NS4) {
//            value = document.height;
      } else {      // IE
            if (document.documentElement && document.documentElement.clientHeight) {
                  value = document.documentElement.clientHeight;
            } else if (document.body) {
                  value = document.body.clientHeight;
            }
      }
      if (isNaN(value)) {
            value = top.innerHeight;
      }
      return (value);
}

function getWindowWidth() {
      var value = 0;
      if ((DOM && !IE) || NS4 || Konqueror || Opera) {
            value = top.innerWidth;
//      } else if (NS4) {
//            value = document.width;
      } else {      // IE
            if (document.documentElement && document.documentElement.clientWidth) {
                  value = document.documentElement.clientWidth;
            } else if (document.body) {
                  value = document.body.clientWidth;
            }
      }
      if (isNaN(value)) {
            value = top.innerWidth;
      }
      return (value);
}