// FUNKCE ZAJISTUJICI POHYB A CHOVANI BANNERU
function showBanner(id, minwidth)
{// pro 1280 -> minwidth 1230
   var winW = 0;

 if (parseInt(navigator.appVersion)>3) {
 if (navigator.appName=="Netscape") {
  winW = window.innerWidth;
  //winH = window.innerHeight;
 }
 if (navigator.appName.indexOf("Microsoft")!=-1) {
  winW = document.body.offsetWidth;
  //winH = document.body.offsetHeight;
 }
}
  if (winW >= minwidth)
  {// show banner
     document.getElementById(id).style.display='block';
  }
  else
  {
     document.getElementById(id).style.display='none';
  }
}